New IPhone 4s: I want to use it but i can't?

I have a brand new iphone 4s, and i can't use it until i have a simcard in it, and i don't get my simcard till another 3 days, but my brother has a sim card, if i just used that to activate the phone will it save *** to my phone i don't want? Like contacts or something? I would only use it to activate i then i would give it back to my brother. Can anyone help me? Have they done this before?

Why not wait?

Http://www.hard-reset.com/apple-iphone-4s-hard-reset.html you can use that if all his stuff saves but it shouldn't because alot of phones don't save anything from sim unless you import it. You won't be able to talk or text without the sim and using your brothers will make your phone have his carrier number and plan until your sim comes in but you can use Wi-Fi Internet without the sim card but it shouldn't save his stuff

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