I have been getting a pop up box that says Tmobile temporary unlock expired. A response box of ok is available for a response, but most often the box does not respond to my clicking okay. I will then have to lock and unlock my screen or restart the phone to get the box to go away. It may come back within minutes or several hours from that point. I googled reasons for the box, but note I never traveled outside my home area, nor requested a temp. Unlock for any reason. When I couldn't solve this after several weeks I spent time on phone with TMobile support. The person helping me could not solve it after trying all of his strategies. Then I went to a TMobile store and they also did not know, but did put a new SIM card in to see if that worked. It did not.
This started when I got a new Revvl 5 phone which has so many other problems I can't imagine this isn't one as well. This phone delays text messages, often prevents callers from hearing each other and must be restarted. It's latest trick is when I hit enter to send a text it just delete it.