A:Answeryou can activate an iphone with pretty much any carrier, you’ll just have to go to a consumer cellular store to get it activated, you should call them and see if they are activating them.
A:AnswerDual SIMs, one is a physical SIM and the other one would be a virtual/electronic eSIM/Number. The purpose can be many, the most common one is to have one personal number and the other number for business in one phone. You will be able to call, receive calls and text messages from/to both numbers in the same phone. There are some virtual (eSIM) providers you may google.
A:AnswerThis is what AT&T instructs customers (How to Swap Active SIM Cards Between Devices). Maybe it will help you too?!
Swap out active SIM cards:
1. Turn your device off.
2. Remove the old SIM card.
3. Insert the new one.
4. Turn your device on.