Palm OS

Seriously? That phone is usually too much for most adults to handle. Let alone teenagers. I bet they would kick your bill thru the ROOF with web access and text messaging. Plus the initial cost of the phone--and you definitely want to get the insurance because teenagers are notorious phone abusers.

No offense to your kids personally. But most phones these days have a little calendar in them and can do text messaging and ringers and take pictures and all the cool stuff that teens want. In more colors too. I'd say stick to midrange phones.