I want to know which country was the model number of iPhone made

ZD is for Germany, Belgium, Luxembourg, Netherlands, Austria, France, Switzerland and Monaco.

https://theapplewiki.com/wiki/Model_Regions

Look at the box it came in.

We can’t determine where your iPhone was manufactured.

Most are assembled in China.

Look inside your USB -C port. The country of assembly is stamped inside.

On a side note. Within legal and regulatory. There seems to be nothing for the UK.

It looks like iPhone 17s are assembled in India. Subassemblies come from all over the world.