Xperia Z3v loses signal until reboot - Xperia Z3v General

Hello!
I'm not sure why, but my Z3V, which I have running on T-Mobile, is having some difficulty getting a decent signal. I checked the engineering menu and switching to GSM/UTMS/LTE has no effect. Once the radio goes out, it's out. At least until I restart the phone.
Has anybody else experienced this while using their Sony on a different network? I tested an AT&T sim and it didn't lose signal for an entire day.

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[Q] Unstable data connection

I've had an odd issue which after many attempts, I have been unable to resolve. Constantly, since the day I bought my HOX+, it loses its HSPA connection, falls back onto 3G, then after a period of time, resumes HSPA. It happened on the stock rom, CM, AOKP, and my current Venom ROM.
It is not a signal strength issue, to my knowledge. I've had several other phones in this town, and I have never ever experienced this with any other phone, even remotely. While watching this issue happen, my signal strength remains constant -63 dBm 25 asu. TBH I don't honestly know what those numbers mean, but for anyone that can help, maybe you need them.
I have the international HOX+ with a Bell SIM card. I love this phone, but this issue is interminably annoying and is the one remaining thing that's keeping me from really enjoying the phone. Any assistance anyone can offer I'd be very glad. Thanks.
Change the sim card.. and try....not just the rom...
Sent from my HTC One X+ using Tapatalk 2
I have an international HTC One X on AT&T (Didn't want their version) and I see my phone go to 3G when it's idle but it goes to H right after I initiate something that requires data. Is that what you mean?
Oh, and does anyone know how to check if this phone is using HSPA or HSPA+. In the settings and by using the 4636 dialer code it doesn't say so. On my Galaxy Nexus it will say HSDPA:8.
Haven't tried switching SIMs. I don't have another one to try, but they're cheap, I'll see if that helps. Also, in the 4636 menu, it shows HSUPA 9, which I believe is HSPA+

[Q] Signal issues after performing domestic unlock

I performed the domestic unlock on my phone about 10 days ago, and everything has been good for the most part. I'm currently using the T Mobile MVNO, US Mobile. I'm located in Tampa, FL, and I have HSPA+ in most areas. I've noticed that if I travel into an area with weak signal strength, usually indoors, and and I lose service, my phone will not automatically come back into service when I return to an area that has stronger signal strength. I have to manually toggle airplane mode, and then it will pick it up. Has anyone else encountered this problem? I'm assuming it maybe has to do with not having the 1700/2100mhz band, but I haven't seen anyone else mention anything similar. It has happened to me on both the MI3 and MJ4 modems. If I go into my phones settings under status, "My Phone Number" says unavailable.
I understand that my phone is not designed to operate on TMobile, so it just might be the way it is. I just wanted to see if this is happening to everyone or just me. If anyone else has experienced a similar issue or has some insight into what might be going on, I'd appreciate it.

Cell connectivity completely drops, then comes back, rinse and repeat

I received my new XA Ultra from Amazon yesterday. Popped in my SIM and started setting it up. It had two software updates out of the box, so I applied them, then started installing apps. I noticed that my cell connectivity would completely drop (no bars), then come back. When I checked in the Access Point settings, the option to discover carriers would appear, then disappear.
I assumed it was some kind of software corruption, so I factory reset, but it continued doing it. I also tried pulling the sim out and putting it back in several times. I can only assume that I somehow got a defective unit or that one of the software updates applied the radio incorrectly. I processed a return with Amazon and have a replacement coming later this week.
I hope Amazon doesn't turn around and resell it through warehouse deals. I have received a few devices from them that they clearly didn't test and I was very explicit in my comments for the return. I'm just hoping that my replacement doesn't exhibit the same issues because I'm not sure what else it could be. It's not my SIM. All of my other phones stay connected to AT&T just fine in the same spot.
greyhulk said:
I received my new XA Ultra from Amazon yesterday. Popped in my SIM and started setting it up. It had two software updates out of the box, so I applied them, then started installing apps. I noticed that my cell connectivity would completely drop (no bars), then come back. When I checked in the Access Point settings, the option to discover carriers would appear, then disappear.
I assumed it was some kind of software corruption, so I factory reset, but it continued doing it. I also tried pulling the sim out and putting it back in several times. I can only assume that I somehow got a defective unit or that one of the software updates applied the radio incorrectly. I processed a return with Amazon and have a replacement coming later this week.
I hope Amazon doesn't turn around and resell it through warehouse deals. I have received a few devices from them that they clearly didn't test and I was very explicit in my comments for the return. I'm just hoping that my replacement doesn't exhibit the same issues because I'm not sure what else it could be. It's not my SIM. All of my other phones stay connected to AT&T just fine in the same spot.
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Did you check before purchasing that it would connect to I'm guessing by AT&T US network's I know yours are different to ours in the UK. I've not had any problems with my normal xa but I'm in the UK
Sent from my Xperia XA using XDA Labs
aidy.lucas said:
Did you check before purchasing that it would connect to I'm guessing by AT&T US network's I know yours are different to ours in the UK. I've not had any problems with my normal xa but I'm in the UK
Sent from my Xperia XA using XDA Labs
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Click to collapse
It's definitely fully compatible. It even downloads the correct APNs, but then they just disappear and the signal drops completely. I get full LTE speeds when it's working and nothing when it's not. I also tested a T-Mobile SIM and, while it holds onto the signal longer, it does the same thing (drops completely).
I plugged the phone into a computer and did a complete software restore, which didn't fix the issue. At this point, I'm sure it's either hardware or a really bad ROM update. I'm hoping it's hardware, because if not, that means that the replacement will have the same issue after applying the software updates to it.
This is my second Sony xa ultra with the same issue here's what happened
Purchases from best buy didn't setup until I got home had 2 update applied them signal drop and reset constantly I figured it was because I have bad reception in my area but the more I looked at the phone I noticed the build quality on the metal bumper wasn't sealed in some areas so I grabbed the packaging and headed back to Best Buy keeping note of the signal issues as I drove there (disconnected from WiFi of course) I noticed the signal did not drop connection at all on the way to Best Buy return the phone and explain to him the issues that I had at home with the signal and also wasn't happy with the build quality defect so I returned it and exchange for another one immediately popped the Sim in it downloaded my APN and I had LTE drove home no drop issues connected to wifi installed the two updates then I drop issue return
630travon said:
This is my second Sony xa ultra with the same issue here's what happened
Purchases from best buy didn't setup until I got home had 2 update applied them signal drop and reset constantly I figured it was because I have bad reception in my area but the more I looked at the phone I noticed the build quality on the metal bumper wasn't sealed in some areas so I grabbed the packaging and headed back to Best Buy keeping note of the signal issues as I drove there (disconnected from WiFi of course) I noticed the signal did not drop connection at all on the way to Best Buy return the phone and explain to him the issues that I had at home with the signal and also wasn't happy with the build quality defect so I returned it and exchange for another one immediately popped the Sim in it downloaded my APN and I had LTE drove home no drop issues connected to wifi installed the two updates then I drop issue return
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Click to collapse
The replacement model I received from Amazon did it as well. Right out of the box, before updates, it was dropping the signal. Are you on AT&T?
I watched it really closely. I think I know what's happening. It's not falling back to HSPA. When the LTE is too weak, it simply drops completely until it can reconnect to LTE. If you set it to HSPA only in the mobile networks menu, you will never lose your signal. I tested it with both T-Mobile and AT&T with the same results.
This is a pretty major defect.
You might be on to something, yes I'm also on AT&T.. but I can't find HSPA in mobile network should it be GSM only or LTE (preferred)
630travon said:
You might be on to something, yes I'm also on AT&T.. but I can't find HSPA in mobile network should it be GSM only or LTE (preferred)
Click to expand...
Click to collapse
It should be something like "GSM/WCDMA Auto" or "WCDMA only". Basically anything without LTE (except CDMA).
I'm honestly just glad to finally have someone else confirm. The chances of having two defective units in a row are extremely slim. Really liked the device otherwise, too, especially for the price.
I tested it for hours. I never got a disconnect on HSPA when I had that set. I just wasn't willing to live with that restriction.
Me as well!! phone is perfect for the price I paid out of pocket I had a BB gift card. I've been shopping for the right phone for a month now I've had about 5 phone from 700 to 200 bucks the expensive ones we're worth the price and the cheaper ones didn't feed my power craving I'm pretty happy with this one for the moment, thanks for the tip
This may be an AT&T SIM related issue.
I have T-Mobile and with my T-Mobile SIM I have no problems. I tried my friend's AT&T SIM, downloaded the APN, rebooted, and sure enough signal drops just like you're experiencing.
I'm having the same exact issue as previous posts with my Ultra. I purchased the unit from best buy the day it came out and using it on AT&T. I love the phone but the issue with completely losing connectivity is a bit annoying. Called customer service and they gave me the same website to fix software issues. Just curious as to why I'll be in same location without movement and then all of a sudden lose my signal.
I have the same problem using cricket wireless which is using att's network, lte signal comes and goes, this is becoming really annoying, is there a fix for this already, or should i return the phone
So I just got off the phone with Sony and they said I would have to send in the phone for repair leaving me with no phone. I've had issues before with phones and the companies just send you a new unit with a box and return label to send back defective unit. The rep said maybe my provider would give me a loaner phone.... Smh Looks like it might be time to leave Sony. Maybe I'll have better luck with the Lenovo Phab Pro 2 coming out next month.
Same issue here, right out of the box today.... Using AT&T reseller and I would have to agree that it is an issue as was mentioned earlier where the phone is somehow not able to fall back on to HSPA on a weak LTE connection so it just completely disconnects. Strange thing is where I am using it (at my desk in my office) I never had an issue of LTE dropping off with other brands of phones. As soon as I left the cell area and started using it at home or at another location further away I had no dropped LTE signals. I think Sony support will be useless unless we can somehow get past the standard support desk. They told me they have no higher support I can be directed to, that I would either just do a software repair (which I assumed correctly would not work) or send it in to service. Not sure what I am going to do at this point, cannot have my phone jumping out of service every 2 minutes during the work day. Any other suggestions would be appreciated.
EDIT: upon further review (using LTE discovery App) it appears that "some" At&t sites are having issues staying connected with LTE band 17 on this phone. I drove up to one of the sites the phone has issues with. It had a solid,strong signal within 1 block of the tower and band 17 still disconnected the radio completely. As soon as it reset and moved to band 4 it stayed on without disconnecting until I moved away from the site far enough for band 17 to kick back in. At that point it continued to disconnect every 1 -2 minutes until I moved the phone mode into HSPA preferred. I don't know what to say about this, band 17 works great on 2 towers within 10 miles of here, but some others and this tower causes the phone to go into a fit. Clearly the phone has LTE issues as any other ATT LTE phone on band 17 I have used in this area has always worked just fine. Anybody have an opinion on this???
I have what I think is the issue, now if we have any way to get this information to anyone who can actually do something about it. I have 2 sites by my home that the phone works flawlessly on LTE... no dropped LTE signal whatsoever. Here is the difference... they are band 17 ONLY sites where the sites my phone is unable to hold a LTE signal when the At&T site is broadcasting both band 4 and 17. That would explain why the rest of the sites around where I work do not maintain a signal either. We need to all contact Sony support and somehow get this information thru to them. The issue is the phone clearly being unable to handle a site broadcasting 4 and 17 which I think is a majority of them.
napali said:
I have what I think is the issue, now if we have any way to get this information to anyone who can actually do something about it. I have 2 sites by my home that the phone works flawlessly on LTE... no dropped LTE signal whatsoever. Here is the difference... they are band 17 ONLY sites where the sites my phone is unable to hold a LTE signal on are both band 4 and 17. That would explain why the rest of the sites around where I work do not maintain a signal either. We need to all contact Sony support and somehow get this information thru to them. The issue is the phone clearly being unable to handle a site broadcasting 4 and 17 which I think is a majority of them.
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It's still not falling back in HSPA like it should. If it has difficulty with an LTE connection, it should not drop connectivity completely.
Sent from my SAMSUNG-SM-N930A using Tapatalk
greyhulk said:
It's still not falling back in HSPA like it should. If it has difficulty with an LTE connection, it should not drop connectivity completely.
Agreed, but keep in mind that my XE ultra was 1 block from the tower with incredible LTE signal strength and it still completely shut the radio down and restarted. This is not for lack of signal but a complete inability for it to handle a band 17,4 tower. Although it would be great if it just moved into HSPA, that would mean your phone would be in HSPA 80% of the time, even when the LTE signal was completely adequate for the area. This clearly is a defect that makes the phone basically unusable (as it continually shuts the radio on and off) until Sony can figure this out. My concern... there is no way to talk to anyone at Sony that can do anything about this until they get enough support complaints directly related to this issue, this could take months not including the time they need to program an update and fix. Very frustrating.
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Frustrated with this as well, hopefully sony fixes this problem more sooner than later
Received an update yesterday and I can't confirm 100% but it appears I haven't had as bad connection (popping in and out). I'm in Houston btw.
I got the update and so far phone has been working fine
The latest updates from sony fixed this issue.. so happy and enjoying it now

Weird cell signal issue on AT&T, Gets stuck on "4G" service level

I am having an issue with an AT&T V60 where, as i'm out and about, it drops to the "4G"(non-lte) service level and every single time it does it gets stuck there. I have watched it lose signal entirely in areas where lte or 5g signal exists. The only way to get it back is to either restart the phone or do a network settings reset, it will never, ever fix itself. AT&T already sent me a replacement phone and it behaves identically, so 2 different v60s behaved this way. I like the phone and it works great otherwise. AT&T is sending me a replacement S20 to see if that cures it but I was wondering if anyone on here would have any idea what might be happening?

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.
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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.

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