"Verizon Wireless wanted to find out which city had the most wireless talkers, so the company launched its first Big City Wireless Use Study, which looked at the top 50 cities by population according to the latest U.S. Census. The big winner of the study was Miami, which made and received more cellular calls than any other. Of course, the survey only concentrated on Verizon Wireless customers."
Interesting study even though it only included Verizon users. I think still it is probably a good indicator of usage. My city of Los Angeles came in second. What did surprise me was that New York didn't make the top ten.