Cingular/AT&T, free network to network, free long distance, free minutes on weekends & after 21:00 (9pm) on Weekdays, great text rates & family plans, REALLY good phone signals.
i have verizon. and i wouldn't use anything else.
i'm on a family plan with two other people in my family.
and the bill is around $70 or less a month.
and i use this phone ALL THE TIME.
plus the service is phanomanol. haha. i get service everywhere i go.