Hhmmm... I thought owning Trinitite was illegal? Or maybe that's just taking it from the site.
Anyways... from what I understand, mobile phones emit waves (3G) in the 850Mhz, 900Mhz, 1900Mhz, 2100Mhz. For 4G, it goes around 1.8 Ghz, 2.3 Ghz, 2.6 Ghz. I'm not sure what 4G LTE and 4G-LTE Advanced uses.
And the effects of those waves, I found this: http://en.wikipedia.org/wiki/Mobile_phone_radiation_and_health
It seems there isn't too much evidence to show this as being serious. I think it's a gimmick, personally. But then again, there have been things which people have thought to not cause any illnesses that eventually did. (Monsato, maybe? Watching news about politics? Keeping up to date with DRM policies and game publisher policies...)
So, yeah. But whether or not the radiation is harmful, I don't think that's important from a sales perspective. If people think they need something, they'll buy it. Some gamers buy a GTX 690 without ever changing their game settings, whilst playing things like Plants Vs. Zombies. Some gamers buy an i7 3970X and a custom water cooler, without ever pushing it.
Some people buy protective rabbit's feet, four leaf clovers, and so forth. From a sales perspective, it's not what people need that matters, or what works; it's what sells. Of course, that's not ethical, but I think this is just an example of people trying to protect themselves from imaginary illnesses and dangers (as has become the US policy for waging war) due to paranoia and fear. So long as people feel compelled to buy unnecessary things that may not have any proveable benefits, companies will be there to cash in on their unfounded fear, paranoia and ignorance. It's the way of the world.
I think P.T. Barnum has a quote attributed to him which mentions this very effectively. Although supposedly David Hannum said it first.