Have you checked out new service from Embrace Mobile, they are a great tool for reaching large number of people on their mobile phones. One can conduct market research surveys over mobile phones and get valuable feedback from actual mobile users.

One can use this kind of service to gain valuable customer insight ranging from opinion polls, brand awareness to customer satisfaction and mystery shopping.

Their services are open for short term or long term surveys for a wide variety of campaigns like Customer Complaints, Audience Response, Advertising Effectiveness, Interview Assistance, Longitudinal Studies and Community Building.  The world is really going mobile!!