Free single patty Sonic cheeseburger with purchase of same of equal or greater value. Redemption Instructions Log in to view the redemption instructions for this offer. Participating locations include: SONIC 700 Cayman Ave Holly Springs, NC 27540 Phone: 919-567-2555 Map SONIC 700 Cayman Ave Holly Springs, NC 27540 Phone: 919-567-2555 Map Sharing Options Share Offer Copy Link