Delayed notifications over mobile data - LG V30 Questions & Answers

Hi Everyone,
I have LG V30 for around 10 days now and I'm experiencing problem with delayed notification only when I use the mobile data(Viber, WhatsApp, Messenger, Gmail). When I'm using Wi_Fi everything comes right away, but on mobile data I start having delays when I'm connected for more than 5 minutes to it. If i turn it off and back on again, all the missed notifications are coming right away. Battery optimization options are disabled and background data is enabled. I had the problem while using Oreo, made upgrade to PIe via LG Bridge, but still the same thing happens. I tried the phone for 3 hours with SIM card from a different operator and actually every notifications was coming right away, no matter for how long I was connected to the mobile data or if the phone was on Standby for 1 hour. So I guess there is a problem with the mobile network of my service provider, but I just can't understand what can it be. I've already wrote them and I'm waiting for their answer.
Does any of you ever experienced such problem, do you have any idea what can be causing it and how can it be solved? I'm using LG V30 H930.

tsunamito said:
Hi Everyone,
I have LG V30 for around 10 days now and I'm experiencing problem with delayed notification only when I use the mobile data(Viber, WhatsApp, Messenger, Gmail). When I'm using Wi_Fi everything comes right away, but on mobile data I start having delays when I'm connected for more than 5 minutes to it. If i turn it off and back on again, all the missed notifications are coming right away. Battery optimization options are disabled and background data is enabled. I had the problem while using Oreo, made upgrade to PIe via LG Bridge, but still the same thing happens.
I tried the phone for 3 hours with SIM card from a different operator and actually every notifications was coming right away, no matter for how long I was connected to the mobile data or if the phone was on Standby for 1 hour. So I guess there is a problem with the mobile network of my service provider, but I just can't understand what can it be. I've already wrote them and I'm waiting for their answer.
Does any of you ever experienced such problem, do you have any idea what can be causing it and how can it be solved? I'm using LG V30 H930.
Click to expand...
Click to collapse
Sounds like you have done the detective work and narrowed it down to your provider.
Sometimes it depends on if your provider is an actual carrier or is an MVNO (re-seller, re-brander) who uses real carrier's infrastructure, paying a wholesale rate for access, albeit with lower priority. MVNOs re-sell a carrier's service under their own brand, but they don't actually operate a network, they own no towers, own no bandwidth themselves.
Using a MVNO, your calls will be the first to get dropped from LTE to HSPA when the network in congested, and your data will be delayed as the underlying carrier's customers have first priority over the MVNO's customers.
I don't know who your provider is, but here in the U.S. we have 4 major carriers -- and then like 50 - 60 MVNOs who re-sell those carriers' services, promising lower cost while "using the same towers!" as the major carriers. However, the trade off is often throttled speeds, as well as lower call and data prioritization (which they don't mention in their sales pitch). Sometimes you won't even know WHICH carrier your MVNO is using (some use a variety of carriers), while in other cases they are publicly linked.
A few years ago I switched my wife and I from a well-known MVNO to the underlying actual carrier (AT&T) just for those reasons. Last year, I switched my elderly mother from sibling MVNO of that same company to my AT&T account for the same reason.
Her texts would randomly stop working, and texting her family members is one of the joys of her life. She's 89 years old. Now on my carrier account, she has no issues -- even though her MVNO used my carrier network. When she had chronic data problems, I was on the phone with her MVNO for hours, multiple times, and it was torture. (Took forever to get to their Tier 2 support people who actually knew what they were doing.) Here MVNO would get it "fixed", then it would happen again. Once they even sent her a DIFFERENT SIM card to "solve" the issue -- which turned out to not be linked to AT&T, but to T-mobile. What the heck? She lives in rural area, not near any T-mobile towers.
Finally, I just drove her to an AT&T store, handed them my spare USS98 V30 and ported her MVNO number to my AT&T, adding her to my account. Problem solved. No data issues.

I'm from Bulgaria, here we have 3 major carriers - each one with dedicated network. We don't have such MVNO, everyone is using the prime service of one of the three mobile operators. I don't have any issues with the speed, also when I'm in the app I'm receiving everything right away. The problem occurs only when I didn't use the app for a certain time, then the messages starts getting delayed.

Related

[Q] Signal no different, performance deteriorated

A lot of text further below, but a simple question or two I would be interested to get a response to: anyone else on the Three UK network noticed any signal issues and performance problems from new to recently? Did you find an answer that made sense? Did you receive one or two Samsung firmware updates from the day the Pebble Blue arrived (on 9th June I think?)
----
I've had a good read through some similar threads here and elsewhere, but there is no gold standard answer so far that makes sense to me or anyone it seems. I have many thoughts running through my mind being new to Android coming from iPhone 4.
Phone is the S3 on Three UK network on the Dorset coast, typical signal strength at home is 3 of 4 bars and it now seems to cycle from H to either H+ or 3G, (but I could have sworn that I had more H+ when new?)
Initially Speedtest gave me a download of 6Mbps which knocked the socks off my O2 iphone (2Mbps), but over the past week/ten days I'm lucky to get 1Mbps at home (at work it has dropped from 1Mbps to 0.1) I've also had phone call issues where I can't hear them, but they can hear me (I know, it could be my provider, but I've checked their website daily and no issues are reported) and this is often with three or four bars. The amount of times websites can't load is frustrating and my other half's Blackberry seems to have no issue on Three. Data roaming is also set up.
Other threads have made me wonder about the firmware update. I know could flash, but there's no suggestion that this works. I also read somewhere that there should have been two updates for me, one at 21MB (which I downloaded) and a second at 31MB, which I have never seen or found OTA or on Kies.
Any opinions appreciated.
The problem is most likely the same as mine.
Since 22 May Three can roam 3g data (not just 2g calls/txts) onto the Tmobile/Orange network. Problem is if the nearest (strongest signal) cell is TMob/O it may well have a much lower bandwidth plus congestion which will dramatically affect internet useage. My dl speeds have gone from 5-6 mb down to 250kb with frequent timeouts. Unfortunately this doesnt constitute a network problem as far as Three are concerned, in fact they are [email protected]@ters because they have just told me thay have been trying to contact me for days re this on my landline number when I have never had a landline number to give them!!
Atb
Chris
SSThing said:
The problem is most likely the same as mine.
Since 22 May Three can roam 3g data (not just 2g calls/txts) onto the Tmobile/Orange network. Problem is if the nearest (strongest signal) cell is TMob/O it may well have a much lower bandwidth plus congestion which will dramatically affect internet useage. My dl speeds have gone from 5-6 mb down to 250kb with frequent timeouts. Unfortunately this doesnt constitute a network problem as far as Three are concerned, in fact they are [email protected]@ters because they have just told me thay have been trying to contact me for days re this on my landline number when I have never had a landline number to give them!!
Atb
Chris
Click to expand...
Click to collapse
Thanks Chris, that all makes sense given what I've experienced and picked up in parts elsewhere. I am guessing that Orange are the other carrier as when I check available networks they do not show up, but instead a "second" Three network does (which does not allow a connection).
Having said that my DL speeds only changed since about mid June?
Not impressed
http://everythingeverywhere.com/
http://forums.reghardware.com/forum/1/2012/05/23/ee_network_intergration/
Im not impressed either. Whole reason for signing up on the One Plan was to do away with my landline (which I did as soon as I confirmed I was getting better dl from my phone). Now I am lucky if I can look at more than two or three webpages before my connection times out, BBCIplayer, 4od and other streaming sites are completely out of the question, as is the updating of my phone with CM9 or updating maps or other large file downloads.
As I have mentioned though, this does not constitute a problem as far as Three are concerned, increased coverage is their priority, they dont ACTUALLY want us to be using up data bandwidth. I have spoken at length to Ericsson who maintain the network who have confirmed the issue I am having, I mentioned to them I was considering cancelling my contract and swapping to TMobile and even they said no point, the issue ISNT with Three, its the fact I am connecting to the closest cell which is Tmob/O. I am quite rural and for years the ONLY network available here was Orange, so naturally most people around here are on Orange (who as we know only offer very restricted data allowances anyway). But all the Tmob/O customers are hogging the bandwidth with their FaceBooking and stuff leaving nothing for me, lol.
Atb
Chris
I am also having this problem. I've had two SGS3s on Three and they're both been the same.
The thing is, my wife's is the same on Orange. I see a lot of other users are having this problem.
I'm browsing the Internet, with 'H', then it goes to '3G' and it just drops out. Phone calls are choppy at best. I can stream video for about a minute before it drops out.
Not impressed.
Hi Guys,
I thought I was going mad, I'm using a galaxy note and at the beginning I thought it was an issue with the phone.
I've had 4-6mb speeds going down to 1-1.5mb and upload speed not going above 100k and dropping, thus making voip telephony or skype virtually impossible.
I called up their tech support they tried to bull**** me with all kinds of excuses, I then told them I have a note a nexus and also tried the sim card on a sony p tablet all of them have the same issue, disgusting speeds.
Something is wrong with their network and this happened suddenly around the 25th of June around the Hampshire area.
I'm thinking about complaining to ofcom and see what happens... not happy

Is GSM free on Nationwide plan?

I am running antp's CM9 build, and I just observed that I am currently on a GSM network. I am using Wi-Fi, so data is off.
So my question is, will this result in roaming charges on my next bill?
I am on the Nationwide 700 minute family plan, with the 4GB promo data pack.
I have the free "Global Services - Pay as You Go" in MyVerizon disabled, but maybe that applies just to data...
I could probably research this some more online, but I figured someone here may be able to answer easily, and I would trust an answer from here more since it could be build-specific.
Thanks for any help,
Max
I don't think I've ever seen a "roaming" icon on my phone, but suspect one shows up if that's the case. Any unusual icons shown on your status bar?
I would change Settings/Mobile Network/CDMA Options/System Select to "Home Only," and then see if it allows you to connect to GSM. That seems to be the only place one can disable call roaming - how it behaves with GSM instead of CDMA is unknown.
Don't know if that's available in what you're running.
But if the global ROM were actually released, instead of just leaked, and you were running that, you might then have a case to argue with Verizon, if it still did GSM voice with "Home Only set, and they charged you for voice roaming. But since it's not a real release, it could be buggy in that respect, and you may get a big bill which can't be disputed (hey, you're running unapproved firmware, VZW can't be responsible if it uses services you get charged extra for). That is, unless you were actually one of the handful of people who VZW actually pushed the global update to - I haven't seen any mention of anyone receiving it except for a few days in the middle of August.
Okay first I recommend changing radio to global version since it auto detect what services your on since it fix a lot of gsm problems and you will only get charge when you leave to eruope , China or out of you city. But turn off data roaming
Sent from my ADR6425LVW using xda premium

Mobile Data is very Slow/Unusable

I'm not exactly sure when this started, but my mobile data connection is nearly unusable nowadays. I cannot do pretty much anything that requires a mobile data connection (download apps, play Puzzles and Dragons, [mostly] browse the internet). The only things that do seem to work are Google searches and Amazon. However, if I connect to a VPN or to WiFi, suddenly everything becomes usable again. This leads me to believe that I am being throttled (or something), but I'm not entirely sure about that. Thoughts?
Phone: AT&T HTC One M8, Rooted, Unlocked Bootloader, S-Off - Running the latest edition of Viper ROM
- I have an unlimited data plan (grandfathered in) and I get great reception where I live (Full bars of 4G LTE).
Those are the same issues I get when I'm throttled. Jus saying
Sent from my HTC One_M8 using Tapatalk
If you used more than 5 GB of data on the network in your billing month, you are being throttled. But you will typically get a warning SMS from AT&T at 4 GB.
You can check your usage in Settings, and within the top "Wireless & networks" section, pick "More" and select "Data usage". You'll probably need to move the sliders to correspond to your billing start date, and it might not be exactly how AT&T measures it over the network. But this will at least give you an idea.
And my data usage reset today and everything magically works again. On the bright side, AT&T is supposedly going to stop throttling sometime this year. We'll see if that actually happens.
everix said:
On the bright side, AT&T is supposedly going to stop throttling sometime this year. We'll see if that actually happens.
Click to expand...
Click to collapse
They are supposedly going to change the policy to only throttle during periods of network congestion; not to stop throttling altogether. And the definition of "congestion" seems rather vague, so it might not even make a difference except as a public relations tactic.
Further, AT&T is in the process of trying to dismiss the FTC's lawsuit regarding the throttling (invoking Tier II common carrier clause, which puts them in the jurisdiction of the FCC instead of FTC). So it seems that AT&T is more concerned with bending the rules than doing what is right.

Need Help, Unlocked S21U losing signal

Guys,
I need some help, I have an S21U (unlocked) from Samsung. Since launch day, I've had no problems with it. I was with Verizon, then had to move to TMo because of coverage at work. I noticed I started losing signal, like dropping completely, showing the no service circle with a slash, which would immediately be followed by full bars. When on a call, the call drops. This happens over and over, making the phone unusable as a phone.
Thinking it was TMo, I switched back to Verizon. Same thing. I've scoured the web, and there are posts out there describing the same issue, but no resolution. So far, I've tried:
-swapping for a new SIM card
-resetting the network settings
-switching carriers
-using app to manually select LTE over 5G (more on that below)
I've read people hard resetting, with no success. Other than selling or return the phone for a carrier-branded device, I don't know what else to do. I think the timing of the problem and my switch to Tmo was coincidental. It SEEMS when the device switches from 5G to LTE I lost all service. But I haven't stared at the screen to be able to confirm that. I've also seen it flipping from LTE to LTE+ to 5G. But when it drop, it drops hard, and I am one of the 6% of people who still need a phone to be a phone.
Any ideas or suggestions? Returning for "service" through Samsung seems like a nightmare, and the local Samsung repair place said all they will do is re-flash the device.
Thanks!
Tmobile is horrible where I am too. I'm a sprint customer and they are steering me to their crap network.
Use routines to set up a button to run 4g lte mode only
5g is very problematic for me and lte works consistently.
I think 5g is still in it's infancy and not worth the extra power usage even when it's a bit faster in good service areas.
robnitro said:
Tmobile is horrible where I am too. I'm a sprint customer and they are steering me to their crap network.
Use routines to set up a button to run 4g lte mode only
5g is very problematic for me and lte works consistently.
I think 5g is still in it's infancy and not worth the extra power usage even when it's a bit faster in good service areas.
Click to expand...
Click to collapse
Thanks. It's not TMo, I switched back to Verizon, same issue. So it's definitely the phone. I did try and select LTE only, it didn't matter. Same problem.
ret4425 said:
Guys,
I need some help, I have an S21U (unlocked) from Samsung. Since launch day, I've had no problems with it. I was with Verizon, then had to move to TMo because of coverage at work. I noticed I started losing signal, like dropping completely, showing the no service circle with a slash, which would immediately be followed by full bars. When on a call, the call drops. This happens over and over, making the phone unusable as a phone.
Thinking it was TMo, I switched back to Verizon. Same thing. I've scoured the web, and there are posts out there describing the same issue, but no resolution. So far, I've tried:
-swapping for a new SIM card
-resetting the network settings
-switching carriers
-using app to manually select LTE over 5G (more on that below)
I've read people hard resetting, with no success. Other than selling or return the phone for a carrier-branded device, I don't know what else to do. I think the timing of the problem and my switch to Tmo was coincidental. It SEEMS when the device switches from 5G to LTE I lost all service. But I haven't stared at the screen to be able to confirm that. I've also seen it flipping from LTE to LTE+ to 5G. But when it drop, it drops hard, and I am one of the 6% of people who still need a phone to be a phone.
Any ideas or suggestions? Returning for "service" through Samsung seems like a nightmare, and the local Samsung repair place said all they will do is re-flash the device.
Thanks!
Click to expand...
Click to collapse
I'm having same issues. However I've always been on Tmobile but I literally have no service at my home or work so pretty much all day. On top of that the wifi calling hardly works so making calls is useless. It drops right as it starts ringing lol. I'm pretty sure my issue is a tmobile issue.
Clear sim card tool kit data.

Question US version (XQ-CT62) t-mobile: no data/internet connection??!!

hi community, i got my usa version of 1 iv and worked with mint-mobile (using t-mobile's network) to connect/activate. Calling/word text worked fine (image via text did not work), but no internet/data connection over 5g/LTE while browsing. Tech support could not get it working and escalated ... wondering if anyone would know how/what could be done. Thx!!
You must be missing the APN config on your device for TMobile. also, check if mobile data is enabled.
Here is T-Mobile info on how to setup Tmobile USA APN:
Tutorials | T-Mobile Support
Not related to the post (getting T-Mobile service) on any of the Asian firmwares at the moment.
I flashed the Euro, US firmwares and no signal at all. The radio power in hidden menu shows as off.
Does anyone know if crossflashing with this model also flashes the radio modem?
Seems to have worked naturally for Xperia 1 II and Xperia 1 III.
Not sure why this doesn't work now aside from intentionally restricting the phone to the intended region model.
Mine is XQ-CT72 global version on US T-Mobil.
I'm getting 800+, but US version should be better because of better band selection.
Mine goes that fast only certain places.
xperialiker said:
hi community, i got my usa version of 1 iv and worked with mint-mobile (using t-mobile's network) to connect/activate. Calling/word text worked fine (image via text did not work), but no internet/data connection over 5g/LTE while browsing. Tech support could not get it working and escalated ... wondering if anyone would know how/what could be done. Thx!!
Click to expand...
Click to collapse
I own the USA variant of the phone and I have absolutely no issues with 5G data nor wi-fi. The only issues I am experiencing is the fact that voice over Wi-Fi has not been provisioned. Coincidentally my phone also tells me within engineering mode that video over Wi-Fi is also not implemented. Sony wants to point the finger at T-Mobile and T-Mobile wants to point the finger at Sony.
Other than that I love this phone.
hnt20 said:
You must be missing the APN config on your device for TMobile. also, check if mobile data is enabled.
Here is T-Mobile info on how to setup Tmobile USA APN:
Tutorials | T-Mobile Support
Click to expand...
Click to collapse
I have the correct APN that you mentioned and still no luck for voice over Wi-Fi. I spent over half an hour with a T-Mobile troubleshooting technician and she was not able to remedy the scenario. They have created a trouble ticket and forwarded up the food chain. They claim you will take about 3 days for them to get back to me so cross your fingers (VoWifi).
igotroot said:
I have the correct APN that you mentioned and still no luck for voice over Wi-Fi. I spent over half an hour with a T-Mobile troubleshooting technician and she was not able to remedy the scenario. They have created a trouble ticket and forwarded up the food chain. They claim you will take about 3 days for them to get back to me so cross your fingers (VoWifi).
Click to expand...
Click to collapse
Ah, that is a different question. that means you are able to get data and your problem is only with VoWiFi which is expected. your original post question was totally different.
Sony blocks TMO VoWiFi in their software by blocking the network code in their settings. You will never get VoWiFi with Sony and TMO together unless you root and hack your sony build settings to enable it.
Your next best option is to move to GoogleFi that uses TMO network and you will be able to get the full VoWiFi service there since it has different network code.
hnt20 said:
Ah, that is a different question. that means you are able to get data and your problem is only with VoWiFi which is expected. your original post question was totally different.
Sony blocks TMO VoWiFi in their software by blocking the network code in their settings. You will never get VoWiFi with Sony and TMO together unless you root and hack your sony build settings to enable it.
Your next best option is to move to GoogleFi that uses TMO network and you will be able to get the full VoWiFi service there since it has different network code.
Click to expand...
Click to collapse
Rats. I've been looking to upgrade from my Note 10+ on T-Mobile, and the Xperia 1 IV looked promising, but VoWiFi being nerfed is a non-starter for my needs. Curse the manufacturers for moving away from expandable storage!
T-Mobile basically did a bunch of farting around and could not provision Wi-Fi calling on my phone. I have confirmed from at least three people on XDA developers that the workaround is to jump on board with Google fi since they do support Wi-Fi calling provisioning.... Or somehow root your phone and find an engineering workaround.
igotroot said:
T-Mobile basically did a bunch of farting around and could not provision Wi-Fi calling on my phone. I have confirmed from at least three people on XDA developers that the workaround is to jump on board with Google fi since they do support Wi-Fi calling provisioning.... Or somehow root your phone and find an engineering workaround.
Click to expand...
Click to collapse
It is Still a good attempt from TMO to try to help, It is really not TMO fault here as nothing they can do. Sony is at fault blocking TMO network code in their VoWiFi software.
Sony has decided to block this service from the second largest US carrier, wondering why Sony sales not picking up in the US
seriously genuine question......why is that so important? I mean, can't you just call a person on whatsupp or telegram or any other service? After all, it is just VOIP, right?
kinggo2 said:
seriously genuine question......why is that so important? I mean, can't you just call a person on whatsupp or telegram or any other service? After all, it is just VOIP, right?
Click to expand...
Click to collapse
Since WCDMA and GSM are sunset, if you want to call someone or receive calls with your phone, you need VoLTE or VoNR. TG and Whatsapp are not that popular in the US, and imagine someone wanting to use their phone as a phone....
well, I get that. We still have 3G and GSM. And every time I work on new rollout things are more and more complicated because of all generations are still in use. Connecting to a unknown wifi every time seems very not practical and if it is not opened public network (which again is not great) how does that work then? I get it if you are at home/family/friends but my question is more like, no cell signal, jut some random wifi. To me it looks more like a patch then an actual service/solution for the lack of cell signal. Or is that something that you really can rely on?
kinggo2 said:
seriously genuine question......why is that so important? I mean, can't you just call a person on whatsupp or telegram or any other service? After all, it is just VOIP, right?
Click to expand...
Click to collapse
The issue is when I'm in my local public supermarket there is no T-Mobile coverage in the building. There is Wi-Fi and I do use Google meet and other apps over Wi-Fi but if someone calls my phone number my phone will not receive the call. That is the point.
Someone would have to actually know that I'm in a no coverage area and utilize one of those other apps to reach me. If not businesses, job offers, local businesses that don't know me personally, someone new that I've met etc etc would never get through to me and I would eventually receive some type of voicemail message indication. That is unacceptable when you have children and other family members and friends that need to get in contact with you immediately.
igotroot said:
but if someone calls my phone number my phone will not receive the call. That is the point.
Click to expand...
Click to collapse
Exactly the point, your phone number is the primary way many reach you. if your phone does not have any 3G\4G\5G coverage, then WiFi might be your only other option that gives people the ability to call you directly with your phone.
OK, but who provides wifi? I get that is is just a voip, but you still need internet connection. So instead of cellular it uses wifi.
Here, in many big business buildings or malls we have indoor base stations, sometimes it is combo indoor and out door. Indoor usually is set up as MIMO so all of the providers share the same indoor infrastructure.
Also, many of public places have a wifi but since we are covered with cell signal, nobody really cares about it. Mostly because you can't just connect to it. you need a pass from your bus ticket or your bill in bars or are greeted with front page of the mall that wants you to register and so on. So using wifi here is PITA, that's why I wonder how all that works there and why is it such a big deal.
kinggo2 said:
OK, but who provides wifi? I get that is is just a voip, but you still need internet connection. So instead of cellular it uses wifi.
Here, in many big business buildings or malls we have indoor base stations, sometimes it is combo indoor and out door. Indoor usually is set up as MIMO so all of the providers share the same indoor infrastructure.
Also, many of public places have a wifi but since we are covered with cell signal, nobody really cares about it. Mostly because you can't just connect to it. you need a pass from your bus ticket or your bill in bars or are greeted with front page of the mall that wants you to register and so on. So using wifi here is PITA, that's why I wonder how all that works there and why is it such a big deal.
Click to expand...
Click to collapse
There are many places that I have frequented where cellular data and cellular calling will not go through. In those places Wi-Fi is available. While you can use WhatsApp and other individual applications to make video calls and even voice calls you will not be able to receive native incoming calls when someone calls your regular phone number nor will you be able to use your native dialer to make a regular phone call if Wi-Fi calling is not provisioned on your phone. Unfortunately our phones do not get provisioned for T-Mobile Wi-Fi calling apparently due to some issue between the Sony and T-Mobile. So by switching to another carrier or mvno, Wi-Fi calling will be enabled reportedly.
UPDATE: Switched to Google Fi.... Problem solved. Wi-Fi calling now enabled.
That part I get, but still don't know which wifi do you use for that. For mobile network, there is a SIM that handles the connection between cells. Phones can't connect to any available wifi, right. So..... I get what it is, but as someone who works on cell towers installations and from perspective of wifi networks here and my knowledge I still don't get which wifi do you use in that case.
kinggo2 said:
That part I get, but still don't know which wifi do you use for that. For mobile network, there is a SIM that handles the connection between cells. Phones can't connect to any available wifi, right. So..... I get what it is, but as someone who works on cell towers installations and from perspective of wifi networks here and my knowledge I still don't get which wifi do you use in that case.
Click to expand...
Click to collapse
It can work on any Wi-Fi network that has adequate bandwidth. I can go to my local Publix supermarket....no cellular signal in there: I turn my WiFi on, I can make/receive calls with the native phone dialer. No cellular tower needed.
Even tested this at home.... I turned Airplane mode on, then afterwards I ONLY turn wi-fi on.... Calls can be made/received.

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