I recently replaced the screen on a friends iPhone 4S, and it made me wonder how profitable it would be to do as a kind of hobby. Has anyone tried this? I always see phones being sold on eBay with cracked screens. Would it be worth the bother when you take into account shipping (and if you're selling on eBay, the 20% commission). If I was going to give it a go, what do you guys think would be a good phone to try it with? I wouldn't want it to be super expensive if I broke it, but it would probably need to be relatively popular so it could still be sold.