@americane: So according to you Sprint and Verizone customers cannot talk and surf at the same time. LOL...Do some more research and FYI the deal between ATT and T-mobile is not done yet. It's gonna take at least 12 month to be effective, go through the below article 

http://tech.fortune.cnn.com/2011/03/20/att-mobile-att-buys-t-mobile-usa/?hpt=T2