Ok so I am looking to buy an original, unlocked iPhone. I've been browsing eBay the past couple of days and will be making a purchase shortly. However, amongst the original iPhones for sale on eBay, there are dozens upon dozens of 3Gs. Most of these claim to have been unlocked, and can be used with any SIM. Now, I was under the impression that because the phone is activated in store, this simply isn't possible. I've done some searching here and other parts of the internet, and get mixed results. Sometimes I read that the 3G is simply unable to be unlocked, while other times it says that you can easily use the SIM of your choice.
Anybody want to give me a concrete answer? And if the iPhone 3G can be unlocked, is it safe to buy one off eBay? If not, I'm just going to go for an original iPhone.