Hasn't Cingular/AT&T been boasting "more bars in more places" for a while?
All i know is that in the DC metro area, no carrier except verizon gets service in the metro (subway for anyone who doesn't live here 😀) and thats huge. A friend of mine used to have t-mobile, and it didn't get service in a ton of places. A couple of my friends have AT&T, and i get better reception on verizon.
Now if only verizon had some cheaper plans, better phones, and good service... 🙁