These instructions are pretty weird, but here goes. Bing has a 35% off offer for AT&T and to get it you need to go to the AT&T site and register under the “premier” moniker. Then go to Bing and search for ATT wireless. Notice the 35% off ad at the top.
Get a Cashback account, go back to AT&T, login to the Premiere service, and pick up your 35% off. This is only for new contracts. If you’re not a new customer, just do all that but don’t worry about the Premiere stuff.
Apparently it’s best done in IE. Let me know if it works.