IPhone 5 call quality issue. (Either call ends or very choppy on the other end)

At random times my calls don't go through. The phone says call ended and doesn't ring. The reception is either full or close to full. This has occurred numerous times while calling different numbers. If I do manage to get the phone to ring, the person on the other end wouldn't be able to hear me as it would be very choppy. I have tried to reset the network settings with no luck. It is a random thing that happens at random times. It is not the carrier issue as all other functions of the phone work. Also this phone is an unlocked unit from Apple and is not in the U.S.

I just replied to a similar post and I'll copy and paste my response here. I was having the same exact issue. Here is my possible fix.
Yesterday I updated the OS to the latest release. Then right after that I called AT&T and they reset my sim card. Or something like that. They did some sort of reset.
I then got in my car and drove around to test the phone. Because that is when the problem is worse. FINALLY they claim to be able to hear me clearly!!!!
I think it was the combination of both the OS update and the sim card reset that fixed it. Hopefully..... It has only been one day but so far so good. I'll update this post if things change.
Try this and let us know if this works for you.

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