at&t (1)

12388597262?profile=RESIZE_400xAfter a nationwide outage last week left tens of thousands of frustrated AT&T and Verizon customers without wireless cellphone service, many were left wondering what caused the interruption.

Faulty equipment? Hackers? Solar flares?

As it turns out, the answer was bad coding on the part of AT&T, the company said late last week.  Before that announcement, rumors circulated online that solar flares might've been responsible for the outage, which caught the attention of scientists at the National Oc