Why am I suddenly getting dropped phone calls

I've had my iPhone 4 since June of 2010 and have been completely happy with it.  Then suddenly last week I started experiencing dropped calls--especially dropped long distance calls.  I make the call, we'll be chatting for 10 minutes or so, then suddenly the person I called can't hear me anymore.  I can hear them, but they can't hear me.  Within a matter of 30 seconds the line goes dead.  If I try to phone back, I can hear them when they answer their phone, but they can't hear me at all.  It's maddening.  I don't know if it's a problem with my phone, with AT&T or both. 
Anyone with a clue?
Debby J

Go to setting and reset networks setting. If that doesn't work call your carrier to reset setting. Last thing you can change your sim card. After that go to Apple and they have a special software to check your drop calls on your phone. If it hardware they will replace your iPhone.

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