It's a bit of a scare tactic to compare it to lead and DDT. Both of those are extremely harmful, but not because of their carcinogenic effects. The fact that cell phones are in their same group on some carcinogen list means essentially nothing, in fact it's not even worth mentioning. I suspect the article only does for the scare value.

If they're going to go that route, they should use scarier things. Maybe they could get rabid bears and Al Queda members listed in the same group.