Any Company will Dick you really..

My Personal phone is with AT&T .. been with them since the bellsouth days.. Never any issues.. like 13 or 14 years.
Yes, I have an JB iphone 4 and it works Flawlessly.

I also have BB w/ Verizon ( Company phone) and I travel a lot w/ my Job.. I get more Drop calls w/ Verizon.
But other then that call quality is damn good as well.. dont know about their support/customer service, since I dont deal with them directly...I'm really hopping my work switches to the I4 soon.. =]

So really, it all boils down to who you want to get Dick'd by...