Want a free McDonalds sandwich? Its easy! Just visit mcdvoice.com survey and complete their customer satisfaction survey using a recent receipt. After finishing the survey, youll receive a validation code. Write this code on your receipt and bring it back to a participating McDonalds location to redeem your free sandwich offer. Make sure to complete the survey within 7 days of your purchase, and dont forget to check the receipt for specific offer details. This is a great way to enjoy a delicious sandwich while giving feedback to improve your experience. Take advantage of this tasty opportunity today!