My friend sold a iphone 4s on ebay and the tracking code says it has arrived to the sellers adress. But the seller has opened a case about the item not arriving and my friend thinks it's a scam so he's affraid he might lose his phone and his money. What should he do? Can he somehow track the phone? It was brand new and factory sealed when he sent it. Can he disable it? Any help would be welcome. Thank you very much!