Atlantic Tele-Network said its earnings jumped 15 percent in the final quarter of last year. The Beverly-based company, which provides wireless and wireline telecommunications services, earned $47 million in the fourth quarter. That’s $6.3 million more than the same quarter in 2011. In January, the company said that it had reached an agreement to sell its US retail wireless business ­operating under the Alltel name to AT&T for about $780 million.