Forrester report “The Mobile Marketing Playbook” published on December 05, 2012 breaks down the mobile market by types of users. What’s amazing to see is that SMS text messages are used by every user in each category except for the 7% that don’t own a mobile phone. If you are going to set up a sweepstake or contest with a mobile component, it makes sense to add text-in entries as part of the entry submission process since pretty much everyone can and does text. A call-to-action that reads text “WIN to 65047 to submit your entry” is much more efficient scanning a QR code or completing a paper form and it reaches all the types of mobile phone users. 
Using Text (SMS) for Sweepstakes Entries Makes Mobile Sense