You must sign up for Firehouse Rewards before your birthday to receive a Free Medium Sub reward, valid once on your birthday or within the following 6 days. No ID required to redeem.
For kids: Use your email address to sign up your child or children (under 13) to receive an offer on their birthday. Please register before their birthday and use your email address. Offer valid on your child(ren)'s birthday or within the following 6 days. Kids get a Free Kids’ Combo with Purchase of a Sub, Chips and Drink, or Free Medium Sub with Purchase of a Sub, Chips and Drink.