I got through High School without ever sending a text message. I'm not old either, I just graduated last year.
The idea that kids need them is total BS. They are nice to have, but that doesnt mean they NEED them.
90% of the text messages I have seen sent were between students during class. That is why 91% of students can fail a test, because they are texting the whole darn day.
If you have a girl then you are even worse off. They go nuts with the texting. My younger, she's 12, managed to rack up a $700+ bill JUST with texting.
Personally I feel that most cases that people use text they either should not be communicating anyway (particuarly those who text and drive), or they should get off their butt and go talk to the person.
Make them pay the bill or just take away the phone.