I agree, I've now been testing GPRS phones as a teaching tool for 6 months. I've done two trials, both very successful.
Trial One was with a group of London Year 9s. They went out on a field trip guided by the on line content we had created to guide them. The students used the devices also to record information as they went.
Trial Two has just finished, a group of AS Sociology students had booster materials delivered to mobile learning devices on loan from Islington CLC. The materials had test elements which were recorded for evaluation.
In my opinion mobile learning devices are extremely important tools.
Jonny Davey
www.oneclc.com