My iPhone is sending iMessages but not receiving them. How can I resolve this?

I have an iPhone 4s with the lastest update of iOS7, AT&T is the carrier.

Take it to the apple store or call try a hard reset hold home and power button till you see apple logo (your memory is safe nothing is wiped)

Go into setting and reset network setting and that should work if not then take it to AT&T because apple has nothing to do with receiving messages your carrier does

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