This doesn’t make sense. The radiation emitted directly from the radio in a mobile phone can not cause a measurable heating effect. The only heating would be caused from radiant heat and conduction from the phone. I swear my phone is almost always stone cold. I think the insulating effect from having my wallet in my front pants pocket would have more effect on my ball temperature than my phone would.
http://www.telegraph.co.uk/news/health/news/12167957/Mobile-phones-are-cooking-mens-sperm.html