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I banned my daughter from using the iPhone she bought. It made her a better person | Em Rio
(www.theguardian.com)
This is a most excellent place for technology news and articles.
I kind of agree. That's why I don't let my kids buy stuff like that. My kid said he wanted to buy a phone, and when I told him it would be subject to our same computer policy (<2hrs/day, they earn time by reading, etc), he suddenly wasn't as interested.
But yes, if you create a bunch of new rules after they buy something, you're a dick. Let them know what the rules will be before they save up for it.