My wife has an iPhone 6s plus, and has noticed that when wifi calling is enabled (and T-mobile WiFi shows as the carrier) her SMS messages and voicemail notifications are unreliable. I have an iPhone 6s and have not noticed this problem. Going off wifi or turning off wifi calling resolves the issue.
I tried contacting support through the mobile app, and they told me that when WiFi calling is enabled you are not expected to get SMS messages or voicemails as you are not connected to the Tmobile network. That does not sound right and is not in line with this article: Wi-Fi Calling .
Does anyone have any suggestions on what can cause this and/or how to troubleshoot it? Or an alternate path to T-mobile support who can help investigate?
Best answer by tmo_chris
So Wi-Fi calling/messaging is something that we support and have the ability to fix. In this specific situation, our tech support teams are going to need to open an engineering trouble ticket for you so that we can take a look at why these messages are getting stuck when the phone is connected to Wi-Fi calling. What I would recommend that you do is, have your wife connect to Wi-Fi calling and have her have a couple friends send her some text messages. Make note of the number that are texting her and the time that they sent the messages. If the messages do not come in, disable Wi-Fi calling and make note of when the messages flooded in. With this information, you can contact our tech teams who can open the engineering ticket with these examples so we can pinpoint the issue.