I had this same issue with where I live. This one day, suddenly, I only had GSM within a 1 block radius of where I live and everywhere else I went I got Edge. I was so irritated and they actually closed the first ticket I had opened. I called back and asked to speak to a supervisor. I live in downtown Austin,tx so this was totally unacceptable. Anyways, after speaking to a supervisor, I asked that they have an engineer check the coverage area and I gave them the closest major intersection. The next day it was fixed (the engineer called me and made sure it was working). You just have to make a big ruckus (like pretty much any other corporation) to get the attention and your issue resoved.
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