Re: Internet bullying...
Actually, some of this "cyber-bullying" can be truly damaging, even more than actual bullying. One highschool girl got "cyberbullied" or whatever in her last semester; her ex-boyfriend sent a spoofed e-mail posing as her, saying "my phone is X, I like to f**k on the first date" and adding her *actual* nude photos. To the entire school. Of course, he could've easily spread the photos on the whole school by himself (which wouldn't require the Internet) but it was easier, and more far-reaching to do it through the internet.
At least with old-school bullying, you can solve it the old-fashioned way: fight back and beat the **** out of the bully 'till he learns not to mess with you again.
As for voice-only phones ... given the 5-to-1 value of SMS-voice costs, I tend to disagree with that. Much cheaper to text than to actually call and spend 10x to convey something as simple as "Going out, meet you in Tacubaya Sta. 8 o'clock sharp. Kisses!" or mere informative stuff like "I've just sent you the package" or whatever.
Mobiles for kids - As soon as your kid starts wandering solo, that's the right time to give him a mobile. That would be sometime around age 12, right after entering secondary school. I got my first mobile at age 15, but that was because *no one in the family had one before* except my dad. My sister got hers when she was 13.