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I'm going to Japan for two weeks and getting a local SIM card. This is my first time using a SIM card.My phone is a Galaxy S21 FE  (not compatible with eSIM) Q1. Will my phone work right after just switching the SIM card? Q2. If my phone needs to cha...

1) I will be changing from a Galaxy S7 Edge to a Galaxy S21 FE ( or S21).  Does the S21 FE (or S21)  work with public mobile?2) Am I correct in assuming that if I replace my current sim card with the new phone, the same phone number will carry over?3...