To enter the McDVoice survey from your phone, simply open your mobile browser and visit www.mcdvoice.com. Make sure you have a recent McDonalds receipt with a 26-digit survey code. Enter the code on the homepage and begin answering the questions about your visit. If your receipt doesn't have a code, you can still participate by entering the store details printed on it. The mobile-friendly site makes it easy to complete the survey on the go. After finishing, youll receive a validation code to redeem on your next visit.