I've been through AT&T, PrimeCo, Sprint, Verizon, Nextel, VoiceStream/T-Mobile and now Cingular. Cingular is by far the best I've had so far.
My daily use phone is an 8125 Pocket PC PDA with Windows 2005. My life.
I also have a D357 Push To Talk phone.
I swap out to a Black RAZR every now and then.
I also have a Nokia 6102 and 6030, Motorola V551 and MPX220, Samsung P227 (black and white) and D807 (white)...
I think maybe a couple others but I forget just now what they are.