I recently had a student with an internet enabled phone to ask me if he could do his in-class research on his phone. I have three computers that were already in use, and had already sent kids to a lab, and he was one of the few left without access. So I said yes, keep it out where I can see it at all times, follow the school rules on internet access, and stay over here with the other computers. I had him using a phone version of wikipedia wapedia.mobi.
Our policy at our school states that phone use is under the teacher's disgression, and I had no problems that day. As a matter of fact, he probably did more work on his phone than he would have on a computer since he was excited about getting to use his phone.
Anyone else having experience with this? Tips? Concerns? Ideas? I think that as more and more phones come available with this option it might actually lower the strain on low budget schools that are hard stretched to provide internet access. But it will of course require the hashing out of new rules and such.