My take on kids and cellphones:
It's as much for the parents as it is for the kids. Once mine got mobile and started having rehearsals, practices, a social life, etc, it was nice for them to be able to call and keep us informed, and vice versa. That they enjoy it and chat with their friends is just a bonus for them.
As far as constant texting and talking - um duh. Maybe you all were unpopular nerds in jr. high and high school, but *I* had an active social life and lots of friends.
This meant sitting on the phone from the time I got home from school til the time my mother made me call it a night. My step-dad finally got sick of me typing up the line all the time and got me my own line - I paid $3 a month for it.
To me this is nothing different than when I was a kid, just a different mode of communication. If the grades are good and the chores are getting done, what's the big deal?