Unfortunately there are quite a few fake iPhones on the market, most of them are iPhone 4 counterfeits, but with everyone talking about the iPhone 5 and iPhone 6, there is a high risk for coming across fakes for these new iPhones as well. If you are trying to save money and are not buying from the Apple store or official retail store such as Best Buy, then taking time to find out if the one you are buying is real or fake will save you from losing money on an imposter that won’t even work with iTunes.
To find out if the iPhone 6 or other iPhone you want to buy is real or not, go to selflove.apple.com page and type in the serial number of the iPhone. If the device type and model show up as being correct, then it is probably not a fake. Otherwise, save your money and find a real iPhone.
Source Apple