Hello, I am trying to call my friend. We both have an iPhone at the moment and we were texting around 10pm and they sent me a message then an hour later I sent a message back and when I sent the message my messages didn’t deliver and I tried calling and I got the message saying the person you are trying to reach is not accepting calls at this time please try your call again later. They just paid their phone bill a week ago. So their service isn’t disconnected. They reside in California. Could this possibly mean they have blocked my number through their at and t account /carrier ? Is that the message I would get when I call someone who has blocked my number or if they possibly changed their number ?