When I received my new S21 ultra from T-mobile, I did not use the sim card that was included. Instead, I put in the sim from my old phone. Everything seems to be working fine except rcs on goigle messages. It can't verify my number. What happens if I take out that sim, and put in the new one? Does that also have my number on it? Will my device work, or will I have to call T-mobile support and have them do something?