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T-Mobile Wi-Fi Calling Issues

Anybody else having issues with T-Mobile Wi-Fi Calling? Mine connects after a reboot, stays connected, but after a while it disconnects from WiFi calling and more often than not it doesn't want to re-connect again until I reboot the phone.
I suspect it may have something to do with the Doze mode in Android M, but I'm not sure. It feels like once it gets in doze mode it doesn't want to connect to Wi-Fi calling again.
Any known ways to force it to reconnect to WiFi calling, without rebooting?

Not sure what's happening, but I'm not receiving incoming phone calls when connected to WiFi calling. I've turned it off at home (have decent enough voice service) for the time being.

jc monkeyballs said:
Not sure what's happening, but I'm not receiving incoming phone calls when connected to WiFi calling. I've turned it off at home (have decent enough voice service) for the time being.
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I've seen that too, it's definitely flaky.

Came here just to get more info on this issue. Flaky on mine as well. I'm on T-Mobile. Sometimes users will hear me well, sometimes they cannot. It's typically most flaky when I'm right on the cusp of getting a tower signal. I'll receive a WiFi call and all will sound fine, but as soon as I move close to a window the call quality drops and users on the other end can barely make out what I'm saying. Almost like it has a hard time deciding between WiFi or the cell tower.

gokousupasayan said:
Came here just to get more info on this issue. Flaky on mine as well. I'm on T-Mobile. Sometimes users will hear me well, sometimes they cannot. It's typically most flaky when I'm right on the cusp of getting a tower signal. I'll receive a WiFi call and all will sound fine, but as soon as I move close to a window the call quality drops and users on the other end can barely make out what I'm saying. Almost like it has a hard time deciding between WiFi or the cell tower.
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Do you have it set to prefer wifi calling?

First day in office tomorrow on a 6p, will test this.

sirxdroid said:
Do you have it set to prefer wifi calling?
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I've had it set to both at different times in the past few weeks. Right now it's set to prefer WiFi because I have poor to non-existant celluar coverage indoors (both at work and home). My wife's old LG G2 has flawless WiFi calling at home.

I have mine set to "Wi-Fi Preferred". It's worked without any problems that I know of both at home and at work, for both calling and text messaging.

highvista said:
I have mine set to "Wi-Fi Preferred". It's worked without any problems that I know of both at home and at work, for both calling and text messaging.
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This has also been my experience, Connects instantly and stays connected. This is also the first phone I have had that actually hands off to mobile network when leaving a WiFi area without dropping the call. The galaxy s6 advertised this but never once did it work. I get pretty good service at my house and honestly didn't know that I would be able to use WiFi calling when I bought my 6p. Pleasantly surprised.

After a few days, text messages won't send. I get an error -1 code. Had to turn off Wifi=preferred.

Tsuul said:
After a few days, text messages won't send. I get an error -1 code. Had to turn off Wifi=preferred.
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See whether this helps:
Dial *#*#4636#*#* as a "normal" call from the stock phone dialer
You should see a menu
Tap Phone information
Scroll down
Tap "Turn ON SMS over IMS" button (make sure that after the button actually says "Turn OFF SMS over IMS" -- this means it's currently ON)
Based on info from this thread: https://www.reddit.com/r/Nexus5/comments/1vahlr/fyi_if_youre_on_tmobile_your_sms_is_sent/
I would not touch any other settings in that menu and if it doesn't help, you should probably revert it back.
Now I'm not sure where these settings are persisted and if they get reverted back when a new radio is flashed for example. Does anyone have more info?

It works but I've found that it causes my phone to stay awake, so I've turned it off. I'd rather lose 1-3% overnight and not 8-10%.

sirxdroid said:
See whether this helps:
Dial *#*#4636#*#* as a "normal" call from the stock phone dialer
You should see a menu
Tap Phone information
Scroll down
Tap "Turn ON SMS over IMS" button (make sure that after the button actually says "Turn OFF SMS over IMS" -- this means it's currently ON)
Based on info from this thread: https://www.reddit.com/r/Nexus5/comments/1vahlr/fyi_if_youre_on_tmobile_your_sms_is_sent/
I would not touch any other settings in that menu and if it doesn't help, you should probably revert it back.
Now I'm not sure where these settings are persisted and if they get reverted back when a new radio is flashed for example. Does anyone have more info?
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Gave it a try and re enabled wifi calling preferred. I'll post an update, but the error usually takes a few days before showing up.

My Wi-Fi calling was working fine, then I flashed the update to 6.0.1 and it doesn't work at all. It's enabled in settings, strong WiFi signal, but it never indicates Wi-Fi calling.

I had the opposite experience, I updated to 6.0.1 and now WiFi Calling is a lot more reliable than before. Still not perfect, but much better.

No data after having WiFi enabled for a while

Hello,
I've had this issue across more than 1 device and more than 1 carrier.
Here's what happens:
I enable WiFi, and for a while everything works as expected. I can send and receive MMS messages. I can disable WiFi and go back to my 4G connection.
The problem is, after an unknown amount of time, the phone drops the 4G connection in the background. I only know when I can't receive/send MMS messages anymore. At that point, if I disable WiFI there's no 4G data connection, and I have to turn Airplane mode off and turn it back on.
This is really annoying. It happened to me using Sprint and a Galaxy S4 (both stock and custom ROMs) and it's happening to me with a Galaxy S5 from MetroPCS. (I've used the stock Metro ROMs, Stock T-mobile ROMs, and Custom T-mobile ROMs).
Right now I'm using a Stock T-mobile ROM with the latest firmware, carrier is MetroPCS.
What can I do so this doesn't happen? It's really frustrating.
Thank you for your time.

Disabled "Smart Network Switch" in WiFi Settings?

*Detection* said:
Disabled "Smart Network Switch" in WiFi Settings?
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Hello.
That's already disabled.
Should I enable it?

I tried with "smart network switch" enabled and disabled and problem still happened.

My S5 G900F Android 5.00 (Smart Network Switch disabled, Power Save disabled) on EE UK has had this problem for 9 months after phone upgraded itself to Lollipop (EE win the accolade to being the SLOWEST ON THE PLANET to provide Android updates.....). Since Jan 3, my wife's G901, a couple of weeks after it upgraded from 5.0 to 5.02, has developed the same problem. Neither phone has ever been rooted or other.
I have fruitlessly searched everywhere for a solution without success. EE Customer Services Tier 2 & Samsung's own service centre have failed to fix it. EE & Samsung blame each other for 5.1 or 5.1.1 not being available for download. Neither is prepared to resolve the issue despite hours on the phone. Have tried Safe Mode, Factory Reset, clearing everything, reloading APNs & Samsung even reloaded Android. All a waste of time: Many many days of it!
After approx half an hour connected to Wi-Fi, only way to get the mobile data to connect, is either reboot, enter & exit Air-plane mode or flip the 4G > 3G > 4G connection under More Networks. Have tested the fault in different cell areas countries and continents; fault is same everywhere.
It seems there are quite a few sufferers of this problem.

Samsung S5 keeps losing data connection
I have the same problem. My new Samsung phone loses the data connection (even though data is turned on) and I can only re-connect by restarting the phone. The first EE shop I took it to couldn't help at all. The second gave me a new SIM - that didn't work. Then I tried online support and after 3.5 hours of my life, in which I was passed on from one person to another, they completed a factory re-set - which didn't work (and additionally lost all the personalisation of my screen and some of my contacts). So I now have a not-very-smart phone which I have to re-start every time I want to use data. This is a business contract and the phone is less than two months old, but I'm not getting any effective support from EE. Android version is 5.0.2

me too, since last update. and app 'phono' shows "mobile data off" not got a time on it, but when i leave wifi coverage, it wont reconnect to cell data 2g/3g/4g. flightmode toggle to restore.

Abandon hope if you have this intermittent mobile data problem!
...at least until there is a software update, though I have no idea if that will help.
I have now tried a new sim card, a factory reset, and a replacement phone - which was provided only because I'm a business customer and I found a sympathetic member of staff. *By the way, I was told that if you are personal customer they won't consider replacing your phone if it is more than a month old - even if you started complaining about the phone as soon as you got it, the chances are a month will have elapsed by the time they put you through the hoops of a new sim, reset etc - and then it is too late to insist on a replacement phone.
In any case the replacement phone didn't resolve the issue so I have reached* a dead end. My phone fails to connect to data after having been connected to wifi - you have to do it manually each time you move away from a wifi connnection. At first I was doing it by restarting the phone, but am now following the advice of someone else who has the same problem and am going into flight mode and out again. *
This is not satisfactory, and it seems from reading forums that EE are to blame for the problem rather than Samsung, but I'm not 100% sure about that.*

Possible solution that works, for me, at the moment!
Having suffered this issue of my S5 (SM-G901F) not connecting to mobile data after being on Wi-Fi for a while unless switching airplane mode on/off for a few weeks; although it has probably been happening since the update I received late December; I have tried all of the turn this switch off, factory resets (x2), etc, etc, etc. and Googled the issue without success.
I have found this thread interesting, and I even tried calling EE support only to be told "you have tried everything that we would tell you to do" and "it wouldn't be a sim card, or handset issue, sounds like software". The reply was basically that like-it or lump it until the 5.1 update is released "by Samsung not EE because EE do not release Android updates". [Perhaps EE don't release the updates, but the stock rom is tested by them and their bloatware added before they eventually release it!!!]
Following my last reset I tried selectively re-installing the apps I used incase that was causing the issue. No Luck!
One last thing I tried was to look at every system 'thing' that I could find which used/switched any part of the mobile/mobile data/wifi - in addition to the settings I had already tried (all of which were mentioned in this thread previously). One thing I could not find not mentioned here, or anywhere, was the VoWi-Fi call on/off which I had always set to on as I do not live in a great reception area. Calling over Wi-Fi is great when you don't have a strong mobile signal.
Having 'played' with this setting for the last 24 hours I have found that the VoWi-Fi on/off appears to be a possible cure - for me anyway.:fingers-crossed:
When VoWi-Fi was set to off and leaving the phone connected to Wi-Fi overnight, the S5 immediately switched to mobile data this morning when I turned the Wi-Fi off . It continued to switch between Wi-Fi and mobile data all morning whilst out and about in and out of Wi-Fi connections - Woop Woop!!!
I then tried switching VoWi-Fi on (with Wi-Fi on and at home), leaving the phone for a number of hours, only to find that when I turned Wi-Fi off the phone refused to connect to mobile data even with a 'decent' mobile signal. The only way to get it to connect was to go back to switching Airplane mode on/off.
Switched VoWi-Fi off again, left Wi-Fi connected, left the phone for a couple of hours, etc. and hey-presto immediately switched to mobile data when I turned the Wi-Fi off. [Dances around the room because he's got the S5 automatically switching to mobile data again. Even though I'm at home with a great fibre internet and strong Wi-Fi connection!!!]
I do not know if this could be a solution for the others who are suffering from this issue, but it appears to be a solution for me at the moment. I thought I would share as your previous posts have helped me and you all seem to be pulling your hair out; like I have been; trying to find a solution.
Try it, it may work, but don't shoot me if it doesn't!

It's encouraging to know that I'm not crazy. I've had this issue across two devices and carries.
John,
Thank for your suggestion about WiFi calling. Unfortunately, I always have it off! I never used it, so maybe I should try turning it on? We'll see lol.
At this point, I think this is going to be my last Galaxy line phone.

Is it wi-fi calling that's causing the problem?
I have wondered if there is a link with wi-fi calling, but haven't tested it properly. I signed up with ee and bought the Galaxy phone specifically so that I could use wifi calling, as the town where I live (in the Scottish Borders) doesn't get a mobile signal strong to work reliably indoors from any of the networks. I'll try turning off wi-fi calling to see if that sorts the data thing (though I see that for one person above it did not). That would mean I wouldn't get calls or texts when I'm at home so it would not be a permanent solution for me. But in fact the wi-fi calling is not reliable anyway....

Brian_svc said:
It's encouraging to know that I'm not crazy. I've had this issue across two devices and carries.
John,
Thank for your suggestion about WiFi calling. Unfortunately, I always have it off! I never used it, so maybe I should try turning it on? We'll see lol.
At this point, I think this is going to be my last Galaxy line phone.
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Brian,
You never know the way things are going with this issue; given that nobody seems to be able to pinpoint the fault; turning it on may just sort it!!!

still no change and its a pita.....

Sim card disappears after 2-4 minutes when making calls with VoLTE enabled

My v20 drops all calls between 2 and 4 minutes in, and usually around the 3 minute mark. The call drops, signal goes to zero, and a moment later I get a toast message saying "Loading SIM card contacts..." and then I can immediately dial back in.
WiFi calling is disabled, though the setting being on or off doesn't seem to make a difference. I've cleaned the SIM card and added tape to the back to ensure good connectivity - no change. I also went to T-Mobile and they replaced my SIM on the spot but it immediately happened again in the store and in front of the clerk when we tried a call. They've suggested a warranty exchange.
One interesting thing I've found though is that disabling VoLTE calling fixes it entirely - it no longer drops calls, but of course there's no HD voice and I can't use band 12 and they're already cutting back on HSPA coverage.
Haven't found anything else useful via Google or XDA. Even with VoLTE enabled there are no data drops, VOIP calling via hangouts works fine. Anyone have any ideas short of a full exchange? Not rooted and while the LG backup app is pretty good, I really don't want to go through the day-long process of restoring everything if I can avoid it.

Hey there! I had the same issue, exchanged the phone for a new one, and STILL have the same isssue! Did you ever find another fix? This is so annoying and I cant believe a bigger deal isn't being made of it.

Something wrong with ur
operator
Sent from my LG-H990 using Tapatalk

Been owning V20 for about 5 weeks now. The first 3 weeks were pleasant until I started seeing dropped calls. Disabling VoLTE did not help. Changing sim card wouldn't help either.

I'm having similar issues H915 Freedom Mobile.
Was roaming on AT&T in the US when I first did the update. And everything was fine till I was home and on Freedom.
When Wi-Fi calling is enabled. It makes no difference if mobile preferred or VoWIFI preferred is selected. It enables either way after reboot or turning Wi-Fi adapter off and on again.
Incomming calls frequently don't come through regardless of whether vo wifi is on or off. Texts same problem. And persists sometimes on cellular and sometimes on VoWifi.
Get SIM errors, signal drop constantly. And have tried everything I can think of to rectify the issues with zero success.
Anyone with Freedom having similar issues? Or any suggestions I might not have thought of that may be the the cause?
- Chris

Wifi-Calling T-mobile?

Hello Everyone,
Does anyone know if this phone supports Wifi-Calling via T-mobile?:cyclops:

It does. I tried it last night. Turned to airplane and turned back on wifi, made a call just fine over wifi on T-Mobile.

I had no idea it could do that, but since my house is a bit of a Faraday Cage my G5+ starts the call as a provider call (T-Mobile) & jumps over to WiFi as soon as the connection is made. Totally threw me for a loop, I've wanted this feature on an OON phone for several years... way to go, Moto... oops, I mean Lenovo
Dave in San Jose

I might be missing something but it doesn't say WiFi call when set to WiFi preferred and I'm on WiFi. I try turning airplane mode on and WiFi on and get a message that I have to connect to a network. In TMobile.

frommars6 said:
Hello Everyone,
Does anyone know if this phone supports Wifi-Calling via T-mobile?:cyclops:
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It works fine for me!

jrc2 said:
It works fine for me!
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Does not work for me. Brand new 2gb ram version from Fry's.
Sent from my Moto G (5) Plus using Tapatalk

radoste said:
Does not work for me. Brand new 2gb ram version from Fry's.
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Did you enable it in settings? I've found it to be a little finicky sometimes, but it usually works pretty well.

It works but for me caused SMS/MMS delivery issues with the wifi router i was on. So i turned it off. I can turn it on when i need it for now, no need.

Get an sms app that supports forcing sms over cell even if you are on wifi like textra.

Sorry to bother, but it doesn't work for me. I have wifi preferred and wifi calling enabled, but it doesn't work when I do airplane mode-with-wifi on.
Any chance this could be due to APN settings? Can someone with this working share their APN? I know on my previous phone (Nexus 6), the T-Mobile APN settings were confusing and tricky. Thanks in advance!

Turning on airplane mode got wifi calling and SMS to work for me no problem. I have "wifi-calling preferred" selected in settings - is there any good way to get it to switch over automatically when cell service is poor? would like to not have to hit airplane mode every time.

rogueleader25 said:
Turning on airplane mode got wifi calling and SMS to work for me no problem. I have "wifi-calling preferred" selected in settings - is there any good way to get it to switch over automatically when cell service is poor? would like to not have to hit airplane mode every time.
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Actually, you shouldn't need to turn on airplane mode. That seems to just be a way to confirm it is actually using wifi since it ensures cell radios are turned off. It will automatically switch if you do not turn on airplane mode. If you look at the phone when a call is connected, it will confirm that it is a wifi call. This is a small drawback to the Moto G5 Plus software. Unlike other phones that actually tell you that the phone will use wifi in the notification area, this phone only acknowledges the wifi calling after the call is made or received. It would be nice if they would change that.
However, I am having a problem with mine not working properly on wifi. It seems that calls will not always go through to my phone. The phone will ring, but won't let me answer the call. It will quite often show the same call repeatedly even though I cannot answer the call. The caller tells me they hear nothing the entire time it should be ringing and eventually gives a busy signal. It doesn't even go to voice mail so they can leave a message. Sometimes it works perfectly, but there is no way to know when it's not going to work. I used to be able to get it to work again if I switched off wifi and connected to LTE, then made a test call before turning wifi back on. Now I can't seem to get that to work any more. Anyone have any idea what could be causing this?

Hi brothers,
Please, can you share some screenshots of these VoWIFI options in settings?
I feel the "reteu" (european) version doesn't have enabled VoLTE and VoWIFI.

Calls dropping, data dropping, trouble sending/receiving MMS

I have the OnePlus 7T Pro Mclaren 5G, on tmobile with the latest OTA firmware 10.0.40.HD61CB. It drops my calls, sometimes won't even allow me to make calls, sometimes data does not work. When connected to wifi wifi calling and texting works. I called OnePlus, and they blame tmobile. I contacted tmobile and they don't seem to know anything or care. I have 2 automatically generated bug reports. My phone alerted me there's a bug and it generated a bug report. I am not sure if these are related to the problem. But I would appreciate help, I do not know how to interpret these reports.
I have rebooted, cleared cache, reset network settings. Tried adding an APN from the tmobile support page. turned 5g on and off. Nothing made a difference.

dylan07 said:
I have the OnePlus 7T Pro Mclaren 5G, on tmobile with the latest OTA firmware 10.0.40.HD61CB. It drops my calls, sometimes won't even allow me to make calls, sometimes data does not work. When connected to wifi wifi calling and texting works. I called OnePlus, and they blame tmobile. I contacted tmobile and they don't seem to know anything or care. I have 2 automatically generated bug reports. My phone alerted me there's a bug and it generated a bug report. I am not sure if these are related to the problem. But I would appreciate help, I do not know how to interpret these reports.
I have rebooted, cleared cache, reset network settings. Tried adding an APN from the tmobile support page. turned 5g on and off. Nothing made a difference.
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I'm running into the same issues you're having. I thought it was my phone only, so you'tr not alone in this. I did noticed that the issue started after the Oct. security patch 10.0.40HD61CB, my sms would sometime come in late or gets stuck on data or wi-fi , my call would suddenly drop or doesn't even connect at times. I'm on the same boat friend, until our voice is heard through Tmobile with enough complaint and hopefully they can fix this bug. Hopefully somebody have already figured out the solution and maybe shed some light.

If you run lineage or the other aosp rom the problem goes away. I was having the same issues as well. Missing calls unable to send texts or receive them sometimes.

I'm having these same issues as well.
Sent from my OnePlus7TProNR using XDA Labs

dont call tmobile, always use twitter @ tmobile help center.

jdaproduca said:
If you run lineage or the other aosp rom the problem goes away. I was having the same issues as well. Missing calls unable to send texts or receive them sometimes.
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This. I was getting super frustrated by not being able to use my phone as an actual phone. I have Ting Mobile which uses TMo, and I was having the same issues. I was on the Stock Rom and ever since switching to the Illusion Rom, I haven't experienced those issues anymore. It sucks that we have to do that. Imagine being non-technical and oblivious. I'd be so pissed after buying this phone. I think this is a OnePlus issue and not a carrier issue.