My captivate is a happy camper under AT&T here in the San Francisco Bay Area. I live in Santa Cruz County, CA and regularly pull in 2.5mbps in town, and 1.5mbps everywhere else. I'm covered more or less everywhere in the Bay Area and Santa Cruz Area, and i can pull in 480p Youtube videos without hiccups, even downloading apps quickly. I pay $19.40 (with commercial discount) for 2GB of Data, if i pay $40 a month I get 4GB of data & tethering, which is nice. My call quality is generally good, and the phone holds onto calls well. The only thing I dislike about AT&T on this phone is all the preloaded apps.