AT&T users were once again having issues with their wireless service, with the carrier confirming on Tuesday afternoon that it was having difficulty connecting calls to users on other networks. "There is a nationwide issue that is affecting the ability of customers to complete calls between carriers," an AT&T spokesperson told CNET in a statement. "The carriers are working as quickly as possible to diagnose and resolve the issue." The spokesperson added that "nationwide 9-1-1 services are operating normally ...