Best Buy (BBY) forecast current-quarter sales and profit below analysts’ estimates as the biggest U.S. consumer electronics retailer by store count struggles with falling sales of mobile devices.

The company’s shares fell 3% to $30.50 in premarket trading on Thursday.

Best Buy also said it would buy back up to $1 billion in shares over the next two years, and it announced a special dividend of 45 cents per share.

Best Buy forecast revenue of $8.25 billion to $8.35 billion and a profit of 31 to 35 cents per share for the first quarter. Analysts on average were expecting revenue of $8.45 billion and a profit of 39 cents per share, according to Thomson Reuters I/B/E/S.

Best Buy expects revenue declines in the first half of the year, followed by growth in the second half, CFO Sharon McCollam said. “In this context, we are targeting flat domestic (U.S.) revenue for the full year … but recognize that it will be challenging without a strong mobile cycle.”

Sales at established stores fell 1.7% in the fourth quarter. Analysts on average had expected a 1.3% fall, according to research firm Consensus Metrix.

Sales of computing and mobile devices fell 6.8% in the U.S. The category accounts for 43% of the company’s total U.S. revenue.

Best Buy’s net income fell 7.7% to $479 million, or $1.40 per share, in the quarter ended Jan. 30.

Excluding items, the company earned $1.53 per share from continuing operations, beating the average analyst estimate of $1.39.

Revenue fell 4.1% to $13.62 billion, but came slightly above the average estimate of $13.61 billion.