Mondelez (Trident, Stride and Dentyne) is targeting the chewing-gum-loving teenagers who are also the largest text-(SMS)-messages-loving demographic. Using SMS text messages as the sweepstakes entry method is a no brainer. SMS also makes truly an “instant” win sweepstakes. You text in and you get an immediate response saying whether you won or not. See screenshots below.
All this is supported by a mobile optimize entry form and a desktop entry form. Mondelez does a good job at executing this sweep.