Apparently in response to T-Mobile's ongoing Un-carrier initiative, the second-largest U.S. carrier, AT&T, on Wednesday announced a new time-limited promotion that incenitivizes both existing and new subscribers with a $100 credit.
Customers are invited to activate a qualifying wireless line for any smartphone, feature phone, tablet, wireless home phone, MiFi puck or other connected device to claim their $100 bill credit per each line...