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What phone do you have now?
Just do a backup and restore your new phone from the backup once you've activated it.
 
I upgraded my 2g to 3gs a few days ago.
went to AT&T Store and activated the new phone with new sim.
when I get home, I backed up old iphone then sync new iphone.
that's it. every data was there.
enjoy new one😀
 
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