How can I find out where my iPhone was made?

That appears to be an iPhone 15 Plus, manufactured for the Japan market.

Parts for the iPhone are made in a number of different facilities around the world.

It is not possible to say exactly where your phone was assembled, but there is a good chance that it was in China, India, Malaysia, Vietnam or Indonesia.

Although your phone might have been designed and assembled for use in Japan, that does not mean that it was manufactured in Japan.

The original box has country of origin information, if the country of origin or destination requires it. It always says designed by Apple in California. It may also state country of assembly with components from.

As global conditions change, multinational companies change manufacturing suppliers, assembly points and component suppliers.

I think the two iPhone assembly points, depending on models, are China and India.

Here is the breakdown for iPhone 15 +.

https://www.phonearena.com/news/iphone-15-series-production-by-contract-manufacturer_id156131#:~:text=25%25%20of%20iPhone%2015%20units,the%2060%25%20assembled%20by%20Luxshare.

I took the question at face value, but in the future if we get a Model Number to work with, maybe we should answer questions like this with information about where the iPhone was possibly "manufactured" and what country it was designed to be used in?

Neither of us would know where the phone was manufactured and as you suggest, it could have been built in a number of countries. But, we certainly can determine where the phone was intended to be sold with a degree of certainty.

Thanks for adding that Bob. I thought they might be asking where the phone was manufactured to be used. I guess your answer, where it was manufactured makes more sense?

Good point!