Q: I have purchased iphone 6s plus with face time in saudi arabia. I need to check whether this phone original make apple or duplicate. So please help me how to find this issue.

Hey There, I am assuming your question is "How to determine if my iphone is real or fake". If so then if you go here https://selfsolve.apple.com/agreementWarrantyDynamic.do Just enter your serial number and the code and if its "real" then it will show you the model of the Iphone and warranty dates. If not, then you know the rest. If not that then try downloading apps from the app store and run them or can it connect to itunes. Tell me which one worked best :D -Jon

If you physically purchased it in Saudi Arabia and FaceTime works, it's likely a knock-off.

Please check the model number at: Settings - General - About - Model = ???