How young is too young for an iPhone?

James, 5 months ago

My daughter, ten, has been hounding me to buy her an iPhone for months and I'm at the end of my tether. It doesn't matter what I say or alternatives I offer, she won't accept anything other than the latest and greatest iPhone. Apparently all of her friends have one and it's making me feel guilty.

How young is too young to own an iPhone and what would you do if you were me?