Best Buy said handset sales remained strong in its fourth quarter, with a “low double-digit increase” in phone sales in its U.S. stores.

The electronics retailer did not break out specific figures for sales of mobile devices, but reported that its gains in the U.S. market were most pronounced in flat-panel televisions, notebook computers, mobile phones and digital imaging.

Best Buy’s U.S. stores posted sales of $12.6 billion, an 11 percent increase over last year. Sales of consumer electronics increase 4.2 percent.

Overall, Best Buy made $779 million in its fourth quarter, a 37 percent increase from the same period in 2009.

For the full year, Best Buy posted sales of $49.7 billion. The company expects its 2011 sales to come in around $52 billion and said it would resume its share buyback program as part of an effort to boost its stock price.