In fact mobile phone transmitters give out less radiation than your mobile phone and even your vacuum cleaner and most other household appliances. Although im not too sure about the new 3G and the 4G ones.
Although i agree with the fact that they should be kept away from schools to discourage kids from using them not so much the transmitters, but the damage the actual mobile will do.
So lads, your doing yourself more damage by having your phone in your pocket by your b@lls and god forbid when you get up and do some cleaning.