I have Cingular and am very happy with them - much better than expected. I get coverage even when Verizon sometimes doesn't in my area (north of Boston). I tried Sprint and ATT but didn't like them near as much as Cingular. I also used to have Nextel and they were just fine, but they didn't have a bluetooth phone that would work with my X. That's when I switched. They may have them now - haven't checked lately.