Turns out, that may be a good thing. While the debate still rages on the connection between cell phone use and brain cancer, I think it's wise to be cautious. Researchers have only recently begun researching the effects of mobile communication technology on children. The Environmental Working Group has tips on how to reduce your exposure to cell phone radiation. It wouldn't hurt to take precautions, especially if you use your mobile phone frequently. You can also look up your cell phone model to see where it ranks on the list for radiation emissions.
I've always been reluctant to put a cell phone right at my son's ear. We always put the phone on speaker. It's not always the easiest way to have a conversation with grandparents, but it does add an element of fun for our kid. Just like allowing computer time, I think teaching moderation at an early age is a step in the right direction. Besides, don't all the kids text these days anyway? I'm still learning all the shorthand for that!