Would it be a good idea to buy one off eBay? (of course from a good rated seller) I would like to get one, unlock it when the tool is released and use an pay as you go SIM card. Why? Because I don't want to carry around an iPod touch + a Cellphone... My concern is that probably the eBay seller had to activate the phone when he bought it (or maybe not)... would that be a problem for me? Thank you in advance.