"We've taken integrated devices mainstream," AT&T chief marketing officer David Christopher said in a statement. He said that nearly one third of AT&T's postpaid customers use smartphones, and in March, the operator led competitors with 11.8 million smartphone users, according to M:Metrics. The number is compared with 5.1 million smartphone subscribers for Verizon Wireless 4 million for Sprint and 3.7 million for T-Mobile.

Christopher touted AT&T's WiFi and 3G networks that make mobile data accessible to everyone and its line of smartphones and "quick-messaging" handsets. This weekend, the operator launched an ad campaign on CBS that highlights its smartphone position. Interestingly, the operator isn't featuring the iPhone.

For more:
- see the Wall Street Journal
- check out this release