How to know if my iPhone is original?

See if it appears under warranty information:

Check Your Service and Support Coverage - Apple Support

or:

Settings > General > About ( if using iOS 12.2+)

The only way to be certain a device is not "fake" is to only buy one from Apple or an Apple Authorized dealer.

saisankar48 Said:

"Is my iphone original or fake"

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These forums are here for everyone out there to view. So, just be certain to keep personal information(Serial Numbers) off of these forums and other forums too. Anyone out there can read this info. For your Security & Privacy: I have asked the host to rid of the images you've provided. :)