My daughter recently turned 10. Her big present was a mobile phone I bought second-hand off ebay (a Nokia 6100). Needless to say, she's been over the moon having acquired such a "grown-up" device. I'm sure it gives her bragging rights with some of her friends but she's not allowed to take it to school - school rules.
Honestly I'm not a big fan of raising techno-kids despite being a geek myself. I've refused to buy any of the handheld gaming platforms no matter how cool they are. The tamagotchi's were a mistake but thankfully their batteries have died. There are better things kids should do with their time and imagination. A mobile phone was previously out of the question too.
However, the mobile phone is more for myself really. I figure I can now feel more at ease letting her roam out of sight knowing I can call her anytime. I'm not sure that's freedom or just a really long leash.
As an aside, I lost my mobile a few weeks ago and have now got another one I bought off of ebay (yeah, I'm shopping on ebay a lot now). I'm on the same number as before. If you want R*'s number, drop an email to me.