Why does my phone say limited service?

[AC Question]

I have a Galaxy Note 4 with t mobile and it has been saying limited service for the past few months. I cannot make calls or texts and there is a crossed out circle in the notification bar where the signal is supposed to be. I did a factory reset and I tried my sim card in another phone and it worked. I went to t mobile and they said they didn't find anything wrong. What can I do to fix it?

 

[B. Diddy]

Welcome to Android Central! Have you checked the APN settings to make sure they're correct for T-Mobile? https://support.t-mobile.com/docs/DOC-2090#subhead2