yeah, exactly, at&t has a more 'advanced' network than t-mobile, its just that they way oversubscribe it. I could go into the details of GSM and it being time-division vs cdma being code-division and the adv of code-division, but that would just bore people.
it may not actually.
a friend of mine works for l3 communications. he had explained to me in the past, why/how verizon is better than the others. i can't remember though.
as for at&t vs t-mobile? the exgtent of my travels are generally nj, pa, and up/down the east coast. never any dead spots, except in 2 wooded areas near south jersey regional airport.
mom on the other hand(at&t) hits dead spots in the carolinas, southern georgia, and in different areas around my brothers house in florida.....not to mention all the drops she has around here in nj.
i'll be paying attention...if i feel that their service is dropping.........then i'll go to verizon.