Very good service. Data has been up to 5x faster than when I was with Verizon. Calls are clearer and have had no dropped calls. Service is hit and miss in the hills. But that is with Verizon too. Just depends where you are. Sometimes AT&T has good service, other times Verizon. The type of phone a person has can also make a difference on how good the service is. Crappy antennas=crappy service. Cell towers do not discriminate. If someone with AT&T (or Verizon) is having good or decent service in the same place as you, its either your phone or possibly the SIM card is bad. I drove from the Black Hills to North Dakota then to MN. About 500 miles. I did not lose service once. I had a minimum of 1 bar the entire way. Most of the time hanging around 3-4 bars at least. Been to Keystone, Rapid City, Belle Fourche, Spearfish, Deadwood, Sturgis, and other towns in the Black Hills and have had ZERO problems. So I'm not sure what other posters problems are. But my experiences with AT&T have been very good.

even with no bars reception is good

This phone has great reception!