I found a iphone 4s can i use it?

I found a iphone 4s, i think its on 3 network, i have a 3 iphone sim card how can i use it, don't tell me that i should return it to the owner etc i would like to know if its possible to use

Return to the owner don't be stealer if you steak u kill

To answer your question, because the iphone 4 uses a micro sim card, and the iphone 3 has a regular sim there's no way for you to insert your iphone 3 sim card into the iphone 4. You would be better off going to the at&t store and buying a new micro sim for it. It shoulnt cost you more than 20$ for the micro sim itself.

Return it to the owner or hand it in to your local police station

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