I am attempting to switch my Verizon GS4 handset to Straight Talk Wireless, but I can't do anything to change the APN settings. I restarted my phone multiple times with the ST SIM in the slot, but it continued to connect to Verizon's network. Some research later, I found that I needed to change the APN to Straight Talk, but I can't.
Only Verizon's LTE access shows up in the menu. There's a + button at the bottom, but it's greyed out, with either SIM (tried both as per this HTC One thread). Pressing the menu softbutton gives me the "reset to default" option, also greyed out and inoperable.
The phone is rooted, still running Jellybean 4.2 MK2 because once I rooted, the OTA updates would fail, and I was never brave enough to try Safestrap. I'm worried this might be part of the same break.
tparadox said:
I am attempting to switch my Verizon GS4 handset to Straight Talk Wireless, but I can't do anything to change the APN settings. I restarted my phone multiple times with the ST SIM in the slot, but it continued to connect to Verizon's network. Some research later, I found that I needed to change the APN to Straight Talk, but I can't.
Only Verizon's LTE access shows up in the menu. There's a + button at the bottom, but it's greyed out, with either SIM (tried both as per this HTC One thread). Pressing the menu softbutton gives me the "reset to default" option, also greyed out and inoperable.
The phone is rooted, still running Jellybean 4.2 MK2 because once I rooted, the OTA updates would fail, and I was never brave enough to try Safestrap. I'm worried this might be part of the same break.
Click to expand...
Click to collapse
In my experience, IT DOESN'T MATTER!!!
I do NOT mean that in any disrespectful way to you, but I DO mean it in a way against Verizon and Tmobile.
I have the same phone AND the same problem with service; however, I CAN add an APN. The catch is IT STILL CONNECTS TO VERIZON!!!
Now, my phone updated to the utter crap that is Lollipop, and I can no longer get my call-Verizon-voicemail-and-disconnect workaround to work as the connection is a lot more seamless and does not drop/fully disconnect after the call disconnects. Before, I'd goto my notifications and see "NO SERVICE" in the bottom of the slide down box with my VZW voicemail notification with it's 10 voicemails. Then, I'd do my workaround and everything would work (and, by everything, I mean text messaging as voice and data WERE working pre-workaround). But, like I said, now I can no longer do that (Lollipop SAYS it's connected to Tmobile off the bat (right after booting up); however, I CANNOT send text messages NO MATTER WHAT I DO!!!
It's completely aggravating and how Verizon can say they sell a phone "UNLOCKED" when their APN is in there with other APNs and GREYED OUT so you CANNOT REMOVE IT (which, as I've shown above, causes massive problems) and how Tmobile can say ON THEIR SWITCH WEBSITE that my VERIZON SAMSUNG GALAXY S4 *WILL* WORK on their network... it's all beyond me. It's deceptive/straight up lying marketing and the way Tblowbile always tells me they cannot support my phone and to buy a new phone WHEN THEIR OWN WEBSITE SAYS IT WILL WORK is 100% bait and switch and up for a class action lawsuit!
Update: it does appear my service with the ST SIM really is through my Straight Talk account now, despite what the APN settings show. I got my device activation text from ST. This makes sense, since Straight Talk is a virtual carrier buying airtime from the real networks like Verizon.
However, I don't have an LTE connection. I don't have any data connection, just voice and SMS. I'm not sure if that's a problem on my end or the carrier's, but getting the data I'm paying for is less of an emergency than not having any mobile communication.
Has anyone found a work around for this. On straight talk, I can get calls and even internet when set to global network. I cannot text either sms or mms. My APN setting completely grayed out. I can not add or change existing and tried an apn manager with no luck.
I suspect I'll have to flash a completely Verizon-less build to fix it, but I did have an ST representative call me to ask if everything was working and offer to try to help me fix it. I just didn't have time right then and they didn't call back when I asked them to.
Just my experience
Hey not sure if this will help anyone out but I'll add what I've experienced. I have a gs4 running hyperdrive and my data service from straight talk has cut out a couple times before. The first time I just waited, and it fixed itself after a day or two. Second time I called ST and they told me to restart my phone (like I hadn't done that 10 times already). Later that day, data randomly comes back. I noticed that the fix for me was to switch apn settings. Somehow my phone did it automatically. But now my data is MUCH slower than before. Straight talk seems to be a tricky company. You never really know what you'll get with them. Just other carriers' sloppy seconds. Cutouts also seem more common at the end of usage cycles. Seems a lot of people fix it by calling ST
Also, I can edit my APN. Not sure if it's because I'm on an aftermarket ROM or what. But now I'm on the hunt for an APN with better data speeds if possible.
Straight Talk APN
It took me 3 months of calling Straight Talk and telling them they needed to send the right APN settings to my phone, after they finally listened it took 2 minutes until I received a text saying they updated my APN settings. I had the exact same problem as you. I had voice and SMS but not data. And my APN settings were greyed also. Now it says
Verizon Internet
TFTWO.GW9.VZWENTP
You just have to get them to update the APN. Getting them to listen is the hardest part! I hope this helps!
Related
So I bought a phone (Eris) off Craigslist to flash it to Cricket. I was able to get all the settings right in order to have MMS\3g using EPST and enjoyed it for a while. Unfortunately, I recently moved to a town that does not have Cricket in it, so I installed a new rom and was able to Activate my phone with Verizon. Unfortunately, I have been unable to access 3g on the Verizon network and was wondering if anyone could post the correct settings to use with epst in order to get 3g working.
Please, I have searched for them but am either using the wrong search term or just cant find a thread that has the settings I need.
I am currently using KaosFroyo V32 but by the time anyone reads this I will have reverted to a rom which allows me to use EPST.
Thanks,
Q
So I switched over to the Xtrsenserom and, just as I thought, the settings in EPST are all still setup for cricket service.
Im going to try #228 and see what happens now that Im not on a Froyo-based Rom anymore
Peace...
AAARrrgggghhh!!!
This so sucks!! The ota did not change the settings (or at least not enough to allow mobile internet) It was so easy to find the settings i needed to change in order to have mobile internet through Cricket. Why is it so hard to find the ones to revert back? Under the NAM Name it still says cricket but my MDN is correct but I can tell a bunch of the numbers in subsequent settings are connected to my old Cricket account... Please help!!
It's *228 for one. Which page in EPST do you need?
Ah I figured it out. It had my old number as min and crickets info for login and a few other abnormalities resulting from cricket. I gotta say this version of Android 2.1 I reverted to in order to access EPST is real nice. I don't think im going back to Froyo for a while. I forgot how nice the dialpad is where you can just dial in part of someones name and all the numbers that fit your input start appearing
can you send me the settings you used in EPST for verizon. I think I may be having similar issues.
Use the verizon RUU.
This will put everything back, you can *228, reroot, then restore your nand backup and uninstall auto start.
Sent from my Eris using XDA App
You know what, just throw a verizon prl file in there, and you should be able to *228.
Try that alltel verizon hybrids one if you can't find any others.
Sent from my Eris using XDA App
I'm sorry to bring this thread back up.
I just went through 3 days of frustration on this issue and since this thread is the top google result, I want to help others.
I bought a used Droid Incredible that was flashed to Cricket. We had the phone flashed back to Verizon from a local Cricket dealer. However, my data wasn't working at all. After spending 2 hours on the phone with VZW, I learned of ##778. The rep only went through two menus and only one option was different (home nid/sid). It didn't help changing it, and in fact, everytime I do *228, it just goes back to what was in there originally. So anyway...I found the security menu later that night. Noticed that HDR AN AUTH Password and PPP Password said 'cricket'. I deleted that, reboot, and then saw 1x finally pop up, but it wouldn't stick.
Changing PPP Password to vzw made 1x work, but the connection would constantly try to obtain 3g, and reset the connection so it was still unusable for the most part.
Noticed on the Eris (previous phone), those Password values were encrypted...Google research suggested a painful adventure of memory dumps, etc, etc.
Then I found another post.
http://forum.xda-developers.com/showpost.php?p=2563813&postcount=32
I blanked out the two password fields, committed, then went to home sid settings (or home sid profile) and changed network type from simple ip mode to mobile ip preferred. Commit, reboot and bam! 3G was there!. I didn't have to, but a *228 may be necessary. The two password fields got updated automagically and now have encrypted values in them. Life is good.
Edit: just wanted to state that in the middle of trying to get data working, I flashed over the verizon RUU, which didn't help immediately, but may have been a compounding solution.
I cannot for the life of me get Straight Talk data or MMS working. Phone calls and text work perfectly though.
I bought it online from Swappa, completely stock and followed the Straight Talk instructions that came with the SIM. I never got anything, not even a hint of data. Browsers would immediately say no connection, pic messages would just spin and nothing would happen.
So I went online and tried every single APN that people said "This worked for me," tried them all, restart-my-phone party-2013 and still nothing no connection ever.
So I thought maybe it was the AT&T stock image that wasn't letting me connect. I just flashed to Vanilla Rootbox and have been trying APN settings for the past hour or so. Still nothing, nothing ever changes. My signal has full bars but says ROAM. Which is odd because my brother has AT&T Straight Talk and gets data just fine in the same location I am now.
Am I missing something? Mobile Data is enabled, I've tried enabling data roaming multiple times to no effect.
What could possibly be the issue?
ALSpringer said:
I cannot for the life of me get Straight Talk data or MMS working. Phone calls and text work perfectly though.
I bought it online from Swappa, completely stock and followed the Straight Talk instructions that came with the SIM. I never got anything, not even a hint of data. Browsers would immediately say no connection, pic messages would just spin and nothing would happen.
So I went online and tried every single APN that people said "This worked for me," tried them all, restart-my-phone party-2013 and still nothing no connection ever.
So I thought maybe it was the AT&T stock image that wasn't letting me connect. I just flashed to Vanilla Rootbox and have been trying APN settings for the past hour or so. Still nothing, nothing ever changes. My signal has full bars but says ROAM. Which is odd because my brother has AT&T Straight Talk and gets data just fine in the same location I am now.
Am I missing something? Mobile Data is enabled, I've tried enabling data roaming multiple times to no effect.
What could possibly be the issue?
Click to expand...
Click to collapse
Have you tried any of the settings from here:
http://forum.xda-developers.com/showthread.php?t=1856574
perrytheperson said:
Have you tried any of the settings from here:
http://forum.xda-developers.com/showthread.php?t=1856574
Click to expand...
Click to collapse
Yeah those were some of the first ones I tried on both the stock and on this ROM.
I enter them, restart my phone, when I open Chrome it just immediately says
"You are offline. Wi-Fi and mobile data are turned off."
Which is not true, because settings clearly shows Data is enabled in two different places. This is so frustrating.
Is there any way to check to make sure the radio that enables data is still working? I've thought about taking it in to the AT&T store to have them test it because I'm about out of ideas about what it could be.
ALSpringer said:
Yeah those were some of the first ones I tried on both the stock and on this ROM.
I enter them, restart my phone, when I open Chrome it just immediately says
"You are offline. Wi-Fi and mobile data are turned off."
Which is not true, because settings clearly shows Data is enabled in two different places. This is so frustrating.
Is there any way to check to make sure the radio that enables data is still working? I've thought about taking it in to the AT&T store to have them test it because I'm about out of ideas about what it could be.
Click to expand...
Click to collapse
You could try flashing another radio? But if not, I'm sure the people at AT&T could help. Down here they are pretty helpful and friendly no matter what.
Not sure if is your problem but I know with snowjb I and several others had to edit the default XML file then delete the lg one and then goop into APN settings and "reset to default" and select the added ST apn
Sent from my Optimus G using Tapatalk 2
nymica said:
Not sure if is your problem but I know with snowjb I and several others had to edit the default XML file then delete the lg one and then goop into APN settings and "reset to default" and select the added ST apn
Sent from my Optimus G using Tapatalk 2
Click to expand...
Click to collapse
I got my hands on 3 cheap optimus g, my friends have straight talk. Can you help me on a set by step? Or maybe a flashable fix? I if i cant get internet and mms to work im stuck with 4 of these. :0
bump. can't contribute to the discussion as of yet but I'm ending my contract soon and hopefully going to straight talk. would hate to have a phone with no internet
Ciloteille said:
I got my hands on 3 cheap optimus g, my friends have straight talk. Can you help me on a set by step? Or maybe a flashable fix? I if i cant get internet and mms to work im stuck with 4 of these. :0
Click to expand...
Click to collapse
I'll take one off your hands, for cheap
Sent from my Nexus 4 using xda app-developers app
Hello back everyone. I solved the issue!
It wasn't a problem with my APN settings, it ended up being a problem in the activation of my SIM card with straight talk.
I went through the port process and got my number moved to straight talk and my calls and texts were working fine so I figured it was a matter of just fiddling with the APN settings until I found some that worked. I had heard so many stories about this being the case. Unfortunately, in my case it wasn't true. I tried everything.
Good news is: I called Straight Talk and asked them what else I could do. They walked me through settings the APN settings, which was super frustrating, I literally had the correct settings memorized at this point. Then they asked me what phone I had. I told the CSR and she said "okay, I switched something on our side, restart your phone and see if it works." I was dubious because I had done this so many times but I guess she wasn't lying to me because I restarted and it has worked fine from then on.
tl;dr AT&T Optimus G works great on Straight Talk with an AT&T sim. Just call them if the provided APN doesn't work.
For anyone else with this problem:
I was having a similar issue after just switching (from a working Nokia Lumia 520) to a new LG Optimus G. In my case, the APN settings from my old phone (and the site I got them from) appeared to be out of date.
I went to the Straight Talk site, logged in, and went to Support -> HOW TO UPDATE DATA SETTINGS, entered my phone number and selected Android 4+. This gave me some different settings that are now working correctly.
So, I just flashed my old s4 to Straight Talk. Voice, and SMS worked fine right from the jump, only thing I had an issue with was Data. When I went to look everything suggested to change the APN settings. Upon trying, I wasn't able to change anything in the APN setting, everything was greyed out. I spent countless hours trying to figure out solutions.. Here are some things I tried:
Entering Developer Mode
Editing something to "yes" in the customer.xsl file
Adding ro.code_source or something like that in the build.prop file
None of that worked. I'm running Hyperdrive 20, so I would think it would be easier with an aftermarket Rom, but I'm stumped. Any tips?
Verizon to Straight Talk
I'm having the same problem. I have had several conversations with Straight Talk reps and so far their answers haven't helped. They are sending me a new Sim card and that is supposed to fix the problem. I doubt it, but it can't get worse!
Wolf_Taz said:
I'm having the same problem. I have had several conversations with Straight Talk reps and so far their answers haven't helped. They are sending me a new Sim card and that is supposed to fix the problem. I doubt it, but it can't get worse!
Click to expand...
Click to collapse
edit - misread question
I FINALLY have LTE on my Verizon S4.
I now have LTE on Straight Talk!
In settings, under more networks, mobile networks, access point names, tap on Verizon Internet, if you change where it says APN to
tracfone.vzwentp
Tap the back button and make sure it still says tracfone.vzwentp under APN. Then hit the back button and make sure there's a green dot next to Verizon Internet. Then reboot and you should have LTE!
My wife's s4 and my g3 have been on straight talk vzw Sims for a few months now. Every month when the auto refill goes through our data shuts off and the 4g symbol is greyed out next to the signal bars. So I call and they ask me the same dumb questions and then they reset something and I reboot and I have data again.
I saw a thread on Howard forums where a guy detailed out some Apn settings that were different and mentioned something about old and new systems for connecting.
Since verizon is such a bastard about not letting us edit the apns our self fully, I'm going to try this on my wife's s4 next month and try the other apn and this fix on my g3 when the data shuts off. I can edit and create new apns from a hidden menu with shortcut master on my g3.
Brian
Good day all,
I'm encountering an issue: a fairly new phone of mine (Umidigi F1) loses its ability to get data from Verizon Wireless when I install Treble Generic System Images (AOSP-based, typically derived from phhusson's et al work). For clarification, despite being from a small Chinese company, the phone normally fully supports VZW (4G LTE data, calls, and text). While on those GSIs, I get a signal and am able to call people with it, but there is no data from the connection.
The APN settings appear to match the ones that work normally (stock F1 and a Pixel 2), so despite not being able to edit or add a new one, I am led to believe this isn't the culprit. Next, I looked at build.prop; the model, device, and brand info changed from the default states and I believe that VZW may be strict enough not to allow the altered info on their network. Attempting to modify build.prop causes a boot loop, though.
Anybody have any thoughts on what I can do? One of the comments at the top of the build.prop file indicates that it is autogenerated by buildinfo.sh. Should I attempt to modify that instead? Or maybe something else?
Veiran said:
Good day all,
I'm encountering an issue: a fairly new phone of mine (Umidigi F1) loses its ability to get data from Verizon Wireless when I install Treble Generic System Images (AOSP-based, typically derived from phhusson's et al work). For clarification, despite being from a small Chinese company, the phone normally fully supports VZW (4G LTE data, calls, and text). While on those GSIs, I get a signal and am able to call people with it, but there is no data from the connection.
The APN settings appear to match the ones that work normally (stock F1 and a Pixel 2), so despite not being able to edit or add a new one, I am led to believe this isn't the culprit. Next, I looked at build.prop; the model, device, and brand info changed from the default states and I believe that VZW may be strict enough not to allow the altered info on their network. Attempting to modify build.prop causes a boot loop, though.
Anybody have any thoughts on what I can do? One of the comments at the top of the build.prop file indicates that it is autogenerated by buildinfo.sh. Should I attempt to modify that instead? Or maybe something else?
Click to expand...
Click to collapse
many MTK soc devices on pis gsi have this issue with sim based data connection. Some even have issue with sms / text.
I did at one point have data working on one of my mtk phones, only when switched connection typs to 3G. But that was not acceptable because way too slow speeds. A solution may come. but i do not know when.
umidigi-f1-tag
I just got a umidigi f1 and am trying to get it working on Verizon. I have talk ant text(sms and mms) working through sim1. However, like you I can't get data to work.
The odd thing is that I can't seem edit the apn settings. That section is missing from my mobile networks section. I am on a stock rom, not rooted.
The sim I was using is a page plus sim. It gets service though Verizon via Tracphone.
I think my issue is that my apn is not set correctly.
Success!
Go to the phone dialer and dial
*#*#4636#*#*
Go to phone information and change your preferred network type to lte only
The default is lte/umts which probably just good for GSM phones
You should see a lte connect. Hit the ping test to verify if you can ping Google.com
Edited to say, the phone is kind of flaky with regards to the APN setting so ymmv. It was working for me for a while then stopped...
Edited 2: Okay I figured it out. To reveal the Apn menu on Verizon, change the preferred network to LTE only as above, then unselect 4g in the Mobile Network section for the Verizon Sim. Restart the phone. Next time you go to the Verizon section, there should be an Apn setting item. Create the proper Apn for Verizon because the default probably does not work. For me, I needed tracfone.vzwentp.
Here's the phone info screen
Here's the mobile network section for the Verizon Sim. Nonintuituve but had to disable 4g toggle but doesn't have any effect on speed. After a reboot, Apn section shows up
Hellom did you get it to work on Verizon? If so what are the full steps?
Make sure your Verizon sim card is in slot 1. Sadly, it seems like Verizon works best in that slot so not able to use a micro SD card.
On 2 other phones running on Red Pocket Verizon, everything just worked. No need to do anything extra.
Also disable wifi calling.
On my other phone running on tracfone/page plus, I had to do the extra steps in the previous posts above.
Hi folks,
The title pretty much says it all. I've got a new unlocked P6 bought from Google, using it on AT&T here in the US. It doesn't show VoLTE and when I go in to turn on VoWIFI I get an error to the effect that "we couldn't turn on VoWIFI."
The VoLTE worked out of the box on my prior phone (OP6T) but I never attempted VoWIFI with it.
Is there a special process to go through, or do I need to chat up the ATT reps? It's possible I'm not provisioned appropriately; my SIM is the same SIM I've been using on several phones over a good number of years.
Before I go in "cold" to a conversation with them I'd prefer to know exactly what to ask them for.
Thanks
Here's their whitelist:
Note this is the latest updated list (edit)
I had to have them enable it for me. I did it via chat support. It broke the ability took make regular calls but a quick call back (from a different phone) and it was fixed.
starbiker99 said:
I had to have them enable it for me. I did it via chat support. It broke the ability took make regular calls but a quick call back (from a different phone) and it was fixed.
Click to expand...
Click to collapse
Thanks. I will see about chatting them up. Hopefully they won't break my regular phone capabilities.
Frankenscript said:
Thanks. I will see about chatting them up. Hopefully they won't break my regular phone capabilities.
Click to expand...
Click to collapse
Funny thing before I chatted with them my Pixel 6 showed up on my account after they did whatever they did it now shows unknown device. It works so it doesn't really bother me. Edit: I have the unlocked version from Google as well.
Frankenscript said:
Thanks. I will see about chatting them up. Hopefully they won't break my regular phone capabilities.
Click to expand...
Click to collapse
Ask for "advanced tech support" when the dud robo attendant ask what for, repeat.
I posted (edited) the updated whitelist, with more models and harder to read
I double checked my devices... but the proof will be when they still are working.
Lol, what could go wrong?
Yeah, be afraid, be very afraid
On with chat now. Just gave them my IMEI. We shall see soon
OK, I'm all set. I think, or maybe I hope.
The chat function worked well. After getting past the chatbot I spoke with a real agent, explained my need, and she quickly took my IMEI and got it set up in the system. I got a text quickly that some ATT stuff got activated (I'll be able to turn on spam blocking and such). I was able to go in after a reboot and turn on wifi calling, leaving my preference as using Mobile Network.
I made a test call and it actually used the Wifi instead of mobile, which concerned me. I disconnected from my hotspot and tried a call, and mobile network calling worked fine, though.
Agent said my preference setting should take hold within 24 hours, in any case. We also went into the dial menu and verified VoLTE was turned on:
"Open dial and Type *#*#4636#*#* Choose Phone information option from test Screen. Now you can Enable VoLTE Support Provisioned Flag. Restart your device. Now you can see 4G LTE option under Network Bar. This will activate unlimited HD Voice Calls."
It was on and grayed out, so should be active. Just surprised there was no special icon showing in status bar like my old phone had.
Everything seems to be working so I think I'm good to go. Thanks for your help guys!
edit: after getting me set up she did a hard sell to get me to use the eIMEI for another ATT account. I declined.
How can I tell if VoLTE is enabled?
chaimav said:
How can I tell if VoLTE is enabled?
Click to expand...
Click to collapse
See my post above. Enter the code in the dialer to access the hidden menu. It will bring up a screen that shows some settings, one will be the switch for VoLTE. For me it showed on but grayed out, which apparently is the correct setting. If it shows off, that would mean you aren't provisioned for it and need help from your carrier.
Frankenscript said:
See my post above. Enter the code in the dialer to access the hidden menu. It will bring up a screen that shows some settings, one will be the switch for VoLTE. For me it showed on but grayed out, which apparently is the correct setting. If it shows off, that would mean you aren't provisioned for it and need help from your carrier.
Click to expand...
Click to collapse
*#*#4636#*#* Thanks, very nice. On my N10+/pie this is the only place were the VoLTE setting can be seen as a toggle which is on. Yay.
Oh, one other note. Wifi calling seems to be working fine, though I haven't had a chance to check its integration with Google's visual voicemail.
What I notice is that the decision to use wifi instead of mobile is kinda hair-trigger. At my home, LTE bars are low but calls always work just fine. However, now with wifi calling turned on (with preference being mobile network), the system usually decides to use wifi anyway due to low signal. I also noticed at a grocery store, where my phone auto connects to their wifi, that when I was in the back of the store (weak LTE) it switched to wifi calling mode, then switched back to regular mode in the front of the store (strong LTE signal).
So, the system is conservative and moves over to wifi pretty often rather than treating it like a last resort. I guess that is good behavior.
Frankenscript said:
See my post above. Enter the code in the dialer to access the hidden menu. It will bring up a screen that shows some settings, one will be the switch for VoLTE. For me it showed on but grayed out, which apparently is the correct setting. If it shows off, that would mean you aren't provisioned for it and need help from your carrier.
Click to expand...
Click to collapse
I have an unlocked P6 direct from Google on AT&T. I have it greyed out but on. Does that mean I need to contact AT&T?
I had never gotten wifi calling set up on anybody my previous phones, so I definitely needed to get that turned on/provisioned for my account. The rep also told me that adding my non-ATT IMEI was needed; indeed several options became available once that was done. I don't think anybody this was needed for VoLTE though.
So pat of this might just have been due to my account history.
To cap this off, I got a wifi call just now and it transcribed fine.
Frankenscript said:
I had never gotten wifi calling set up on anybody my previous phones, so I definitely needed to get that turned on/provisioned for my account. The rep also told me that adding my non-ATT IMEI was needed; indeed several options became available once that was done. I don't think anybody this was needed for VoLTE though.
So pat of this might just have been due to my account history.
Click to expand...
Click to collapse
Not needed for VoLTE on AT&T as I can switch the sim card between my AT&T N975U1 and unlocked N975U seamlessly. However I never use wifi, tethering or more advanced features on these two devices... so no idea about that.