I have ATT. I do not have an Iphone. Had the service for over 6 years now through its various changes in name. I can't even remember the last time I had a dropped call. Don't really think it has ever happened. Only down side I've seen in my time is in up-state NY at my school there were a few dead spots. I couldn't be happier with ATT.
If nothing else, I will never use either the Iphone or Verizon because of the lack of a sim card. The rest of the world has adopted the sim card format, and I find it unacceptable that both Verizon and Apple choose not to use it.
Btw, Samsung i8510 all the way. 8 MP camera? wat?