There are a few ways that you can redeem your offers from Sonic: In the Sonic App: If the offer is available for redemption in the app, you will be able to find the code in the text message sent from Sonic (876642) If you're redeeming at your local Sonic, the text message will possibly say "Must mention". This means that all you'll need to do is mention the text offer to your Car Hop, and they'll redeem it for you.