If you think of how large their footprint is, you would not be roaming very often on Verizon. So a high percentage of their customers and not roaming. USCC on the other hand has a much smaller footprint, so USCC customers will be roaming a lot more.
Originally Posted by ropp29
Verizon most likely gains more revenue from others roaming on their network than the other way around.
Motorola Electrify (Stock..for now)
HTC Desire rooted with Oxygen ROM
HTC Touch Pro 2 US Cellular with MightyROM and Android as optional boot