A group of 26 Qdoba stores, all owned by Aztec Partners LLC, is expanding its customer loyalty program into the mobile realm with a feature called Qdoba Mobile Rewards. The Mexican chain teamed with mobile loyalty company Tetherball to create the new program. Qdoba Mobile Rewards, which works in conjunction with the chain's existing, "QCard" program, offers rewards, coupons and special notifications to consumers through their phones when they opt in.