Do children really need cell phones?

Check out this blog post about children and cell phones- http://www.christianity.com/11599436/ - this guy is on the money- if we don't have time to monitor our children's phone and texting history, we don't have time for them to have a cell phone.
We sometimes tend to treat our kids like they're grownups, when they aren't. I saw a family movie a couple years ago, where the 15 year old daughter told her dad she had the right to date who she wanted, and the mother was standing there agreeing with her!
My fifteen year old is a very bright, loving, caring person, but she's still only fifteen, and she doesn't always have the wisdom or discernment to know that people can be other than what they seem- and it's my job, and my husband's job to help her find the right path.