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He also said AT&T is broadening its slate of offerings, including to new phones powered by Google Inc.'s Android mobile operating system.
"We have a lineup that we haven't disclosed," he said. "There will be other devices that come along, and we'll do just fine."
On Monday, AT&T announced that it would sell its second Android phone, HTC Corp.'s Aria, starting June 20, and Mr. Stephenson said the top handset manufacturers are pouring money in Android in an effort to build the next flagship device.
"You're going to see Android become more and more prevalent in our device line-up," Mr. Stephenson said.