How to Check if Your iPhone is Original in few easy steps?
1. You can not connect iPhone to iCloud
It doesn't have access to the Apple servers and it's not recognized by Apple.
Fake iPhones won't show your SIM card applications, it won't allow you to create an Apple ID and also they're very light in weight.
2. iTunes Connectivity and Syncing:
A remarkable feature of an iPhone is its ability to entertain its users with iTunes. You can check if your iPhone is fake or original by trying to connect it to iTunes. If it does not connect, or iTunes does not recognize it, it's not an actual iPhone.
3. Check for serial number: https://checkcoverage.apple.com/us/en/
Also read this article: