Here is a list:
https://en.wikipedia.org/wiki/List_of_telephone_operating_companiesThe list includes America, Europe and Asia.
To find wo is who inside of a country, you have to dig deeper.
Sad to say this list does not tell you that some companies are not compatible. Here is a personal experience. My flip phone no longer works. I buy another phone. My SIM card does not work. Well, after two weeks I learn that not all unlocked phones are unlocked. Too hard to explain. I had to buy another SIM card or else another phone. So I got another SIM card.
Your changes of getting the right phone and the right SIM card and the right carries are poor.
This is by design. You will need the help of a technician that knows what's working in your area.