I bought an AT&T branded 10 Pro XL. It shipped with a temporary phone number. I followed the prompts and was up and running in 5 minutes. I went to the AT&T store to transfer the temporary number to an actual number on my account. Unfortunately, the manager was out on lunch break and I got a trainee that didn't know what he was doing. Finally, the manager returned and had me out in about 10 minutes. Once they activate the Sim, it deactivstes any Sim card. If, like me you're used to changing phones, it will be a problem. Hopefully, AT&T will simplify the process so users can switch eSims. You can of course have 2 eSims activated on the phone. When dialing out you'll choose the line you want to use.