AT&T has been able to restore most of its communication utilities affected by the bombing on Christmas morning in downtown Nashville, Tennessee. In its latest update, the company said that more than 75 percent of mobility sites affected by the explosion have now been restored, and it is expecting additional improvements as more equipment comes back online. Mobility service in the Birmingham and Huntsville, Alabama, areas are now operating normally. The explosion that went off outside a building owned by AT&T in downtown Nashville has interrupted internet and phone services in the city and across Middle Tennessee, causing flights to be halted at the Nashville International Airport and outages in multiple counties. The AT&T building was out of power for several hours after the explosion, forcing the company to drill holes into the outside of the building to reattach power to the affected equipment. The crew on Sunday focused on …