[WindowsCentral.com]

While we have seen wireless carriers offering incentives for customers to make the switch to their service, AT&T has announced incentives for customers to stick around.
Beginning today, all new and existing AT&T customers will receive a $100 credit to their wireless bill when they purchase a new smartphone, tablet, feature phone, mobile hotspot or wireless home phone.* This would include the Nokia Lumia 1520, Lumia 925 and Lumia 1020.

Full story from the WPCentral blog...