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I currently have an iPhone 4S on an unlimited ATT (iPhone data) plan. I'd like to try out the Z10 (unlocked) on my account. Can I just swap the SIM or do I have to go to ATT? I've been playing around with the Z10 with wifi only and it's a nice piece of hardware. Now, I'm ready to test it on the phone side.

While I don't anticipate moving back and forth, I might want to go back to the iPhone and don't want to lose my unlimited data plan that I've had since forever. I've seen [people ask the reverse question, going from a non-iPhone plan to an iPhone plan.

Thanks in advance for the help!