We have bad luck with AT&T, but that is our house and we are in a known low cell tower zone. Â My service also can be poor in cloudy weather. Â My husband has Verizon for work and his phone works better and can complete calls when I have issues.
However, my phone almost always works- so you might be okay- it depends if it is your sole phone and how important it is.  I think I've always been able to make calls, but sometimes it does not go through on the first try.  I do have some calls that I don't get (they don't ring and go to voice mail) and there have been times the call didn't register on my phone for several hours (ie, my mom called at 9:30 am and I checked my phone through out the day but didn't get a notice till 2:00 that she called and left a voice mail.)
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If you switch, make sure you test it out and see while you are still in the 30 day (or whatever) return period they have so if you do live in a poor spot you can switch back w/o penalty.  They have been able to run tests over the phone and check on things (I changed a setting to get my phone to work a little better and there also are signal boosters that you can buy for a home location that has poor reception).
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Also, I had a lot of probs this week and called AT&T- turns out they were working on some towers and they reset my phone so hopefully that will help. Â
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AT&T definitely is known to have problems but it really is very specific to the area that you are going to use.
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Jessica