Transfering iP4 to older 3GS?

[DotCom2]

Hubs broke his out of warranty iP4. I have an old 3GS around that has my data on it and synced to my iTunes. (just using it as an iPod now)
How would I go about getting my old 3GS to work for him with all his data and contacts and everything on it just like it was on his iP4?
I do know that the sim cards are a different size so what about that?
Can I just take both phones to and ATT store and they can handle this for me?
He needs a phone desperately!

 

[Shadowbech]

Yes you can go to the AT&T store and have them get him a sim card that fits for the iPhone 3GS. As for the back up goes, if the 3GS is 5.X.X and his iphone 4 was ios 5.X.X as well then there shouldn't be any problems restoring from back up.

 

[DotCom2]

Yes you can go to the AT&T store and have them get him a sim card that fits for the iPhone 3GS. As for the back up goes, if the 3GS is 5.X.X and his iphone 4 was ios 5.X.X as well then there shouldn't be any problems restoring from back up.

Ok.
THANKS!