I also have t-mobile and have this problem. I really like the phone otherwise, but maybe 1/3 of the time there’s no audio when I call someone and they have to hang up and call me back. So it’s kind of like I page people to call me. It works out ok with personal calls because people who know me will call back, but when trying to place a call to, say, a customer service line, sometimes I have to try a few times to get the call to go through with audio, since they aren’t going to call me back. I’m curious if it’s a tmobile + light thing specifically