AT&T posts steep loss for fourth quarter Jan 26 09:18 AM US/Eastern US telecommunications giant AT&T on Thursday reported a $6.68 billion loss for the fourth quarter, citing a costly charge for ending its planned acquisition of wireless carrier T-Mobile. The loss in the final quarter was $1.12 per share, including a one-time charge of 44 cents for the decision to break off the merger, the company said in a statement.