After entering your cell number and zip code, you'll receive a mobile coupon good for a free Subway 6″ sub with the purchase of a 30 oz. drink. Note they'll text you a coupon, but you'll need to wait to open it until you're at the register and ready to pay!
After redeeming your coupon, you can reply back saying you don't want any further text messages. And if you're anything like me, you can drunk text them at 1am while mistakenly thinking they're your ex!