sim question here.

[$tylez]

alright, so i got a new stock iphone 4 from apple for free which unfortunaly, has the 3.10.1 /4.2.1 so it cannot be jailbroken for now. My sister has a jailbroken iPhone 4 and i'm thinking of taking hers instead and she recieves mine. We both are on AT&T and I was wondering - Is there any problem if we actually make the switch? By switch, taking our sim cards out and putting them in the opposite phone. Is there any harm or after affects or is it fine?
Thanks

 

[iGaz]

Your phone can be jailbroken. Just not unlocked.

There no harm in swapping the sim cards...