If I want to switch back and forth between iPhones is it as simple as moving the SIM card from one to the other?

Both iPhones have only been used with my number on AT&T and I want to temporarily switch from one to the other and then, eventually, back.

Yes. Pretty much that simple.

The data would have to be synced to both (depending on which one's data you want). SIM cards are not memory cards.

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