Hand-helds in Education

Today I had a very interesting conversation with my friend from Sokoine University of Agriculture. The talk was about using just-in-time and and what I would adaptive technology for learning. He had ideas of how to use hand-held devices in elearning - especially because the people who own cellphones in Tanzania has increased tremendously over the last few years. This according to him would extend the reach of education to people who are diversely located. One of my reservations though on the use of hand-held devices for learning is the type and size of content. Can the cellphones be used to convey meaningful - and I mean significant content that can be used as learning material? In as much as every technology would bring along its limitations and challenges, I do not think the cellphones are yet evolved for the level of interactivity in content, that I would say can facilitate learning. That is not to say that they can not be used in learning. I believe they can, for example in sending out notices, reminders and any information that can be sent in short messages, urgently.