Ive used Cingular since day 1 - of course I do use the GSM - I pay for two phones with unlimited nationwide - never had a roaming charge in 4 years and Ive called around the country from all over the country
The text messaging costs me $4 a month for unlimited and incoming never had a charge - I also have bluetooth on it for free as well as web access - I can make my own ringtones and graphics from my own MP3s and jpgs , upload them anytime I want without buying a damned thing, and all together I think my bill monthly is around $75 for both phones - Ive never had a problem with signal/dropped calls and I live way out in the country. The only place I saw one of my phones not work was in one valley in Penn.
And most important is since I refuse to pay for MP3s at those ripoff music services like Itunes - I can use my phone as my MP3 player and use any of the MP3s I can fit on whatever memory card I install since it has the mini flash cards as well that hold Gigs of stuff
Should add - since any minutes I dont use roll over and I never use more than 4000 mins I always have some rollover (I think thats what the plan gives me)