Texting issues when connected to WiFi

  • 28 August 2018
  • 60 replies

I've been having an issue for about a week now where as soon as my phone connects to Wifi, I begin having issues sending and receiving text messages. I've been having the same issue as well as my Girlfriend, her Mom, and her Daughter all having the exact same issues when on WiFi. This includes 4 different phones, 3 different Samsung models and an iPhone. All T-Mobile devices. This issue seems to only be with text messaging. No issues with calls or any type of Data or internet related App. Just sending and receiving text messages.

I called support last week because I was certain this was a known issue for many people, but was told it was not. I went through all the trouble shooting steps with the team and nothing they could do seemed to fix the issue. I cleared my cache, checked my data to ensure it was all setup correctly, I'm even now using a brand new Note 9 and still having the same issues. When I called originally I was using my s7 Edge.

I've taken a few photos where you can see the change.

When you're not on WiFi you can see the 4gLTE symbol next to the service indicator and it seems to work fine.

As soon as I connect to WiFi, that 4gLTE symbol goes away. I'm pretty sure it never did this before.

Then when sending I get these errors..

On top of the issue with sending failures, sometimes after taking minutes to send, the person who is receiving the message will get up to 4 copies of the same message. I will also receive up to 4 copies of a message when getting texts. So it's an issue with incoming and outgoing.

This seems to be something that change with an update/service. Not the device or anything. When I got my note 9, the 1st thing it had me do was connect  to WiFi and I immediately noticed this same issue (no 4gLTE symbol) before installing a single APP or anything.

I'd like to point out, this is not always an issue. Most time it works pretty well, however it's a daily occurrence for the last week. Happens while I have full cell and 500MB+ WiFi service.

Please advise how this is to be resolved.




Best answer by tmo_chris 5 September 2018, 17:05

If the messages are only failing when the phone is using the Wi-Fi calling, this is going to be something that we will need to open an engineering support ticket for. Please gather a few examples/date/time/numbers of the failures and contact us so our tech care folks can get a ticket opened up for you.

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60 replies

Same issues here. T-Mobile should be embarrassed that the problem has gone on this long with no solution  

Any resolution to this? It is happening daily on our phone - was a Samsung S5, now a Samsung S8.

Userlevel 5

It doesn't look like OP or the other folks came back after I refereed them to call our tech care folks over the phone so it is possible that having the ticket filed fixed the issue. I would recommend that you do the same when you get a chance @soccer22


I'm having the same issue with my S9 where SMSs Fail To Send... until I disable my wifi connection. Then they send fine.

Seems like a lot to submit that information you requested... I've been waiting for someone else to help you all with research-- I've been checking back for a solution....

Nonetheless, if this still has not been solved, I'll  go ahead and "bite the bullet" and collect/send that data.

Userlevel 5

I know it's a lot @pjwatty 😥 but this is typically account specific and if we fix it for one person, it may not fix it for everyone. The best bet is to Contact Us with that information so that our folks over the phone can get a ticket opened for you specifically.

Just switched to T-mobile and my texting over

wifi never worked. This is on all 4 devices I own.

Texting period is an issue over the T-Mobile network. Very slow and often fails to send. Wife is getting very frustrated and asking me to go back to ATT. Any help in fixing this would be great.

To whomever,

I'm glad I wasn't the only one dealing with this issue and it seems to be the exact same issue. Regardless if I am on a Wifi at work, school, home, etc., in order to send a text, I have to disable my wifi connection (and sometimes turn airplane mode on and off again) to send a text. It is quite frustrating since I cannot use Messages for web as seamlessly as I'd like because I'm always interrupted ~20 seconds later with a notification on my phone saying my text failed to send. My work place is similar as someone else mentioned above; great Wifi signal with little to no cell service so it's crucial for Wifi calling/texting to work properly.

I am using a Galaxy S7.

Hopefully this can be addressed soon.


Userlevel 4
Badge +9

Hey there, are you still using your AT&T phones or did you purchase new ones from T-Mobile?  If you are using unlocked phones, you might want to check your APN settings and make sure it is configured properly for MMS.  An extra note that isn't mentioned in many places where the T-Mobile APN can be found is that the MMS Port can be set at 80.  I have seen this solve many types of issues with sending and receiving MMS using unlocked devices.

Userlevel 4
Badge +9

Hi there! I'm really sorry you're having a rough time getting those messages out.  Are you using a T-Mobile device or is it unlocked from another carrier?

Thank you for the response.

I actually just upgraded to a different phone after that message (S7 to a

OP6). Both were/are unlocked. I don't seem to be having any issues with the

OP6 as of now. I will keep in mind toset my MMS port to 80 if I run into

troubles again.


Well, disregard that last statement.

I wasn't having troubles the night before but this morning I am.

I get a message when I switch airplane mode on and off that says "SIM Card

not provisioned". I'm not sure if this is related but I'll research it now.

Userlevel 4
Badge +9

Are you using the same SIM from your previous device?

Yes I am.

Userlevel 4
Badge +9

If it is saying the SIM isn't provisioned, it can mean that it's not activated.  Is there a chance that T-Mo could have switched the SIM number when you switched phones?  Are you able to make/receive calls/texts at all from it, or access data?

So turns out the SIM not provisioned was for a different SIM card (the

person I bought the phone from left their old SIM in one of the slots). I

took that out and I didn't get that notification anymore with just my

active SIM.

I think I've figured out what the issue is:

I'm reading that in order for SMS/MMS to function properly over Wifi, Wifi

calling must be active. When I active Wifi calling while I have cell

service/mobile data, a smooth transition occurs and I am able to use

SMS/MMS over Wifi. Now, what ends up happening is my Wifi calling will

randomly become disabled (often accompanied with a "Error: Wifi calling

cannot be set up... something, something missing 911 address"). Whenever

this happens is when I notice my SMS/MMS over Wifi stops working (and I'll

notice Messages for Web will say "Not connected to phone"). I'll still be

connected to the Wifi so apps like Chrome, Gmail, Outlook, etc still work

but SMS/MMS won't work until that Wifi calling is reset... somehow. Usually

I reset it by switching airplane mode on and off and allowing that initial

connection to happen again but when I'm in an area (like my work/lab) that

doesn't have cell service, I cannot do this little trick. Either way, I'm

not sure what's causing the Wifi calling to randomly become disabled but I

believe that is the heart of the problem because I noticed it this morning

at my house and now at work.

Maybe it's a bug? Anywho, can anyone else confirm this issue and if I

explained it properly? Maybe T-Mobile can address this (I'm guessing it's a

T-Mobile thing since this has occurred for me while using an unlocked

Samsung S7 and now an unlocked OnePlus 6).


I think the problem is not with the carrier

You can try activate developer settings in your phone.

And then check Keep Mobile Data Option, hope it can help ur problem

I have the same problem.  Test messages are stuck "sending" when connected to wifi.  Happens on different wifi networks (so not a wifi router issue).  This is an intermittent problem.  My phone is a Samsung Galaxy J7 connected to a T-Mobile LTE network.  Turning airplane mode off/on gets the messages to send.  But this is a serious problem.  You never know if your text messages have sent or not. 

There is a bug here for sure.  Looks like the issue was reported to the engineering team back in September.  Any progress to report or workarounds that can help us out?

Has anyone resolved this issue? I have same problem. Pixel 2xl. I have tried everything....


I have "Keep mobile data turned on" selected in Developer Options, and that didn't help either. This is definitely a T-Mobile issue.

My husband and I are having the same exact issues the wifi takes forever to send or I get a failed to send message all started after the last update. Also the cursor likes to jump to the beginning of the message mid text. Super annoying and inconvenient. Please fix this tmobile.


Question to tmobile - i saw the comment saying this was account specific, but have you found any common cause?  Texting over wifi was working fine in my office until a few weeks ago. Now it frequently shows 'sending' before it fails.  I have to try a couple of times to get the messages to go through.  My phone is a galaxy s7 that I have had for 3 years and it was purchased from tmobile.  The cell service is my office is unreliable so I depend on wifi for calling and texting.   

I've always had this problem on T-Mobile networks. I have very bad reception at work, and I'm able to receive calls just fine on their free Wifi. When trying to send/receive text messages, I get network error messages. I thought it was just me. This problem only seems to occur while I'm at work. Though to be fair I have the smart setting enabled that when I'm at work to turn on Wifi and when at home to turn on data. I find the data has a better reception and is a lot more reliable.

I don't think it's account specific when it seems to be an issue for a lot of people. If it is account specific they need to have wifi texting enabled on all accounts when signing up and to current accounts.

Mine has been this way since I've had service through T-Mobile.