I lost my invoice

As kb1951 said:

”Contact the store where you got it from.”

And, for the future, do not purchase an iPhone outside its country of use.

This is a user to user forum and Apple is not here. Contact the store where you got it from.

Find out what store it came from and try to contact them. Did someone buy it for you? Ask them for help.

You’re welcome.

Enjoy your Apple gear.

Actually kb1951 deserves most of the credit.