- The embedded SIM is deactivated on the Verizon version of iPad Pro. When traveling with a Verizon iPad Pro, you would need to swap out the physical SIM card for that of a global or local carrier.
- If you buy the iPad Pro from AT&T stores, the embedded Apple SIM is used and is then locked for both domestic and international use. However, you can buy an iPad Pro from other channels and select AT&T from the embedded SIM and it will be unlocked for both domestic and international use. So, buy from an AT&T store and the SIM is locked and you’ll have to roam on AT&T’s plans internationally. If you buy from another source and manually choose AT&T, it’s not locked and you can switch carriers.
- No other carriers are locked. You’re safe with T-Mobile. However, there is a block in Japan for units purchased via each of the individual Japanese carrier stores (only from other Japanese carriers) and not internationally.
- If you want to use, say AT&T and T-Mobile, you can use the embedded SIM, then put in a T-Mobile SIM and that will override the internal.
When you take it out, it will go back to AT&T.Update: You don’t need to take the SIM out, both carriers become selectable options under cellular settings.
Dodged a bullet there. The reason I felt it was good to get some specifics here is that I highly doubt this will be the last device Apple ships with an embedded Apple SIM. Hopefully Apple can negotiate with carriers to eliminate the ‘locking’ requirement altogether — but don’t hold your breath for that particular utopia.