Voice Calls Breaking Up on AT&T in the US

This is a continuation of the thread I started below:
http://discussions.apple.com/thread.jspa?threadID=1653137
To summarize, voices break up(or cut in and out) when I am on a voice call. I live in the Northern NJ area and I haven't traveled lately so I haven't had a chance to see if I have this problem outside my area.
I determined that the problem is not with my iPhone for the reasons below.
1. I exchanged the iPhone for a new one and experienced the same exact problem.
2. I put my SIM card in another GSM phone(Nokia N70) and experienced the same problem when I used the Nokia phone for voice calls on the AT&T network.
Does anyone else experience this symptom on AT&T voice calls in other parts of the US?
I am planning to get a cell ranger signal booster to see if it helps.

I live and work 30 miles apart in California. I have noticed that voice calls are good were I live but break up were I work. I also noticed that the 3G signal is weaker were I work.
The last few days at work were very windy and the voice call broke up a lot to the point were I disabled 3G just to hear the person I was talking to. For some reason the wind seems to affect the quality of the voice 3G.
Side Note: Since my office is in a area were 3G is not that stable the signal will keep switching from EDGE and 3G when I'm inside my building. This seems to were the battery down faster so I found it better to keep 3G off when I'm at work. This does not happen in my home town were I get a great 3G signal.

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