We have a sort of unofficial "don't ask don't tell" policy at my school (full primary; 5-12/13 year olds). It's fine for phones to be in bags or whatever, but they don't come into the classroom and they are confiscated if a kid is found using one before 3pm (end of the school day) and a parent has to come and get the phone from the office. iPods and such are the individual teacher's call. Generally speaking, those of us who teach the older kids are a little more lenient, and it's probably because so many of our kids own them by then. For example, in my class it's fine for the kids to listen to mp3 players on bus trips and to listen (through headphones!) to Jango or something similar if they are typing up something on the computer. We do make it very clear to students that any iPods and such that they bring in are entirely their own responsibility and that if they should happen to get broken/lost/stolen, well, tough.