This pdf reports on a pilot project and makes recommendations regarding the use of mobile phones, text messaging, etc in a learning program for disadvantaged youth. It includes numerous links to further research.
http://www.flexiblelearning.net.au/projects/media/txt_me_recommendations.pdf
A little while back I was appalled whilst attending an Adobe product launch (for education priced premier elements and photoshop elements for schools) as the adobe education manager was going through the fabulous new features of pshop including the bundled image management system – photoalbum. The system has the feature to auto send images direct to mobile phones capable of receiving mms. The attitude of the presenter was that mobile phones were the scourge of the school yard and should be confiscated on sight.