I've had all 4 major US carriers. In the order I've used them, oldest first, these are my impressions:
Verizon: Best network, insanely bad customer service.
AT&T: Mediocre network, 3G is slower than it should be, so-so customer service.
T-Mobile: Smallest network of the big 4, but truly excellent customer service. Until recently, EDGE was the best they had for network speed.
Sprint: Excellent network, in part because users roam for free onto Verizon when out of Sprint coverage. I'm impressed with their customer service, and they need it because they can screw up a bill or your account settings faster than you could possibly imagine. Superb network speed.
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