Switching Divices

So i purchased a iPhone 5s yesterday and when i comes i am going to activate it on the new line of service that i got it with. After that i wanted to know if i was to switch that phone to my other line that currently has the iPhone 4 would i need to get a new sim or does it cross over automatically?

Correct Answer!

I have done this with other iPhones in the past, and they switched automatically once they were powered back on. I suspect the same will be true with the new iPhone 5s.

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