They're all monolithic and terrible to deal with, just each in their own special way. My two cents is that it's not a matter of finding a good one so much as just finding the one that will irritate you the least.
I had Omnipoint, which became T-Mobile. I vastly prefer the sound quality of a GSM network, which around here means T-Mobile, but I got so fed up with their someone-overseas-reading-from-a-three-ring-binder bureacracy every time I could actually even get out of voicemail hell with them on the phone that I decided to try a different carrier. I've since switched to Verizon, and while the sound quality of CDMA irritates my ears, at least Verizon customer support can and does escalate to people with clue quickly on a service call. *shrug* There's my experience, they both have their pros and cons, hope this helps.
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I had Omnipoint, which became T-Mobile. I vastly prefer the sound quality of a GSM network, which around here means T-Mobile, but I got so fed up with their someone-overseas-reading-from-a-three-ring-binder bureacracy every time I could actually even get out of voicemail hell with them on the phone that I decided to try a different carrier. I've since switched to Verizon, and while the sound quality of CDMA irritates my ears, at least Verizon customer support can and does escalate to people with clue quickly on a service call. *shrug* There's my experience, they both have their pros and cons, hope this helps.