AT&T is anticipating that it might have to sell as much as $8 billion or more of its network to get regulatory approval for its buyout of T-Mobile, sources said Thursday night. The carrier has tapped Bank of America Merrill Lynch to help court potential buyers for the regions it might need to divest with the assumption that the sales could top the estimated figure. The WSJ's insiders were told most of the selloff would come from T-Mobile's side, although AT&T could sell some of its own.