I wanted to know country of origin for my iPhone 15 promax

Most iPhones are assembled in China from parts made in many different countries. Some iPhones are assembled in Viet Nam and India.

Hello~ Tap Settings App > General > About > scroll down to Model. What is the letter that you see?

~Katana-San~

Exactly what are you hoping to accomplish? Country of manufacture? Country of use?

What is the model number at: Settings - General - About - Model = ??