@matigo My son hasn't lost a phone in a while, especially since he got an iPhone. My daughter has lost the same couple phones countless times (later they are found). These are cheap "send and end" Nokias that, frankly, I'd lose too. :P
Meanwhile, my daughter saved up her cash and is getting an iPhone too (just not the data plan to go with it). Which means she'll probably stop losing her phone, or if she does, it's not getting replaced by us.