Can mobile phones kept in the pocket cause testicular cancer?

We put this question to Professor Paul Elliott, Imperial College London...

Paul - This isn't something that is easy to study. There isn't really any evidence to suggest that mobile phones have an effect on fertility, but it is an open question and it's certainly something for example that the WHO (World Health Organization) are interested in. We don't really have a lot of data on that in our study because the exposure assessment is relying on the use of the phone and when it's being used rather when it's sitting quiet. Of course, exposure is much less when you're not actually speaking; it's just hand-shaking to the mobile phone base station.