Outage map shows where AT&T service is down for cell phone users across U.S.

CBS News - For more and to sign up click here Tens of thousands of AT&T customers reported problems with their cell phone service on Thursday morning, with a map of the outage showing people affected across the U.S.Customers of other networks also said they experienced problems, but rival carriers Verizon, T-Mobile and UScellular said their networks were operational and noted that their users were probably having…