If you are beloved customer of McDonald’s, then you can participate in www.mcdvoice.com customer survey. You need submit your opinion based on the Customer experience. The responses received by the McDVoice (en espanol por favor) let them know that how well customers are satisfied and contented.The survey code on your McDonald's receipt is essential for starting the MCDVoice online survey and obtaining a validation code. Contact Mcdvoice’s customer service For any other help. How Can You Win McDonald’s Free Sandwich in Customer Satisfaction Survey ? Do you think participating in online survey on Mcdvoice is not rocket science as it is very simple and easy. You only need to spend few minutes complete the Mcdonalds customer survey. Make sure to save the survey code from your receipt; it's required to begin the MC’D Voice Survey and get your validation code.