In my experience the two best carriers are T-Mobile and AT&T. It just depends on where you live as coverage is the most important consideration when choosing a carrier. In my case they are both strong so I use them both as I have many phones and need a few lines. When traveling the state of CA where I live, AT&T's larger network provides the best coverage. As far as customer service the nod goes to AT&T, even though T-Mobile is also good. The reason being, that AT&T seems to have a larger goodwill budget. In the past when I've been mistakenly overcharged (which happens with any carrier) AT&T has not only reversed the charges without complaint but also given me an additional $100 off my bill as a goodwill gesture. Whereas T-mobile has corrected their error but not offered additional consideration. Next up is BlackBerry selection in which AT&T has a much larger selection of models, usually at lower prices than T-Mobile. Customers like myself that have been with T-Mobile enjoy low pricing on plans, however recently they have increased their rates so that advantage is gone. Thus choosing between those two now would be easy if I was starting fresh as AT&T simply has it all.
~via BoldBerry 6 (wap.rabroad.com)~