AT&T SUCKS.
I was a Centennial Wireless customer for years. They had towers all over and everywhere I went, I had 5 bars of signal.
Inside any and all buildings, anywhere. My cell phone worked perfectly inside my house which has a steel roof, inside stores, inside METAL buildings.
AT&T bought up Centennial and they turned off all the Centennial towers. There is ONE AT&T cell tower now to cover the entire area where I live and the signal strength is POOR.
I get "no signal" inside buildings, inside stores, and especially inside metal buildings. Inside my house, service was usually "no signal" or if I was lucky, ONE BAR.
I would miss calls, and there were constant dropped calls. I was PISSED. However I have an iPhone and moving to Verizon isn't an option.
Even when I put my SIM back in my old Nokia the service was still PISS POOR.
What I did find out through the FCC website, AT&T has turned all the old Centennial towers into ROAMING TOWERS so when I can't get a decent AT&T signal, which is frequently, it jumps me to an old Centennial tower and gives me 5 bars of signal but it says ROAMING here in my home town and I'm charged roaming fees.
IN MY OWN HOME I AM CHARGED ROAMING FEES!!
I bought one of those zBoost yx510 boosters. I had an antenna put up on my roof, 22 feet up in the air and I had the inside unit mounted to the ceiling in the center of my house. Now when I'm in my house I get 5 bars of signal, like I used to get on Centennial, before AT&T screwed things up. This booster, and I'm sure others, are great but they only help you in your home, they do no good when you're in a store and have no service there.
BTW, the cell thinging that AT&T sells, is CRAP. You have to have DSL service and it routes your phone calls through the DSL service and they then charge you data rates for doing so. It's not a cell repeater, it converts your cell phone into a wifi phone more or less. And if you walk out of your house or into your house with the AT&T "repeater" it drops the call, it won't do hand offs. The zBoost does do hand offs flawlessly, I can walk in and out of my personal cell bubble inside/outside and there is no glitch, no drop.
AT&T is a bunch of inept thieves. They are crooks and thieves and criminals and they rip people off with the WORST service on earth, period.
I despise AT&T with every fiber of my soul and being.
I had to spend $400 on this booster to get back service that I once had. I loved Centennial, they were 100% reliable no matter where I went, no matter where I traveled. I never missed calls, never had dropped calls, I was never over charged, I had GREAT terms of 200 minutes a month outgoing and unlimited 24/7 incoming minutes. I would call people and tell them "hey, call me back" and talk for free for as long as I wanted.
AT&T is garbage. AT&T sucks. Worst company on earth run by criminals that needs to be disbanded and torn down. Capitalism at it's worst.
By the way, check out this site, http://deadcellzones.com/
They are also on facebook if you look them up. You can report deadzones in your area.