I need a little Clarification, I got my iPhone Xs Max February this Year, I was Surprised that all that’s written at the back is just ‘iPhone’ not the ‘Designed in California Assembled in China’ inscription, does this mean my iPhone is fake or what

The amount of information displayed on the back of the phone varies by region. In some countries, Apple has to display certification numbers for compliance with local laws.

The FCC labels are no longer present on phones manufactured for the USA. However in other countries / regions such as the European Market, they are still present.

Since the release of the iPhone 8, Apple stopped putting that info on the back of the phone. See the image below of the iPhone XS Max.

Mine is like that also. I am pretty sure all new iphones are like this