I just got an iphone 4s and I'm trying to activate it?

It allows me to text and everything but I can't make or receive calls. And at the top where it should say at&t it says no service. Please give me directions on how to activate my iphone completely!

I had to take mine to the AT&T store.

Put a paperclip into the hole in the sim card slot and reinsert the sim card.

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