Chances are they're banned - to stop students texting their friends all the time, or worse still, cyber-bullying. But are schools missing a trick?
Most teenagers now carry a mini-computer in their pockets, capable of taking photos, videos, podcasts and even surfing the web. Could their mobiles actually be used to enhance their education?
Alex and Charlotte from Westhoughton High School in Bolton wanted to investigate this issue. They interviewed one boy who'd experienced cyber-bullying - getting abusive and threatening text messages on his mobile phone.