That signal drop can be as simple as a Mack truck pulled in and parked at the nearby McDs and the signal bounced off it and nulled out your space. The best thing to do is to change carriers.
I live in Irvine, California, one of the many communities that hugs the immensely large Los Angeles metropolitan area. The AT&T coverage area map shows that my neighborhood has "best" coverage, yet if I am in the ground floor or my home I get NONE. I have to be in one of the bedrooms upstairs to get a tiny little bit of coverage while I hang from the window with a harness and position the cell phone properly to have a conversation. You get the picture. I have tried different telephones, they all encounter the same problem. Thus I attribute this lack of reception to AT&T. Would this be a fair assessment? Is there any suggestion as to what I could do besides getting a land line, or switching to another cell phone service provider?
Also, another question that to this date, no AT&T employee has been able to answer with confidence. Sometimes I'll be having a telephone conversation and I see that the telephone has 3 bars of signal strength. Without moving one inch, without the weather turning into a class 15 tornado, and without electromagnetic forces pulling on my phone... the signal strength suddenly changes to 1 bar and the call quality decreases significantly. Again, I tried this with several telephones with the same result. Does anyone, anyone out there in the technically educated world know why this happens? Is there a logical technical explanation?
Thanks for reading! Dickie