Sorry to beat an old thread.
I think that anyone can have a cell phone, provided they can handle it and won't misuse it. Now the jerks who are "sexting" are the reason kids under 13 have become kind of a "no cell-phone" age. I'm 12 and i constantly use my phone. When i talk to my friend, I do usually text but only for the reason that its cheaper, i have pre-paid (ha!). Are there kids who are too young to have cell phones? Definitley, some 40 year olds can't handle them. I've even seen a 4 year old texting her friends on a cellphone, and her 3 year old brother was texting her right next to her. So it all lays on maturity and responsibility. Besides, with a good enough phone you can hack with it.