For Taking survey at the Official website of mcdvo!ce, go to web browser's address bar & open www.mcdvoice.com & select the espanol (spanish) or english speaking language . Sign in to start mcdvoice survey, only with valid receipt with survey code within 7 days a bogo offers (buy 1 get one 1 sandwich) expires. If you don’t have purchased surveys code, you can also entering mcdvoice official via www.mcdvoice.com 7 days Survey for answering the questionnarie. This Survey questionnaire displayed via mcdvoice com. Just take & particpate in the McDonald's 7 days Survey Website to obtain free sandwich on any sandwich brough from your nearest McDonald's. Then Validation Codes are generated that can be used to redeem the offer printed on your Mc'Dona;ds receipt.