Probably he wants the phone number because it indicates which country someone is from. I mean sure you can still get a temporary number from another country onl

Probably he wants the phone number because it indicates which country someone is from. I mean sure you can still get a temporary number from another country online, so it’s not 100% accurate. Or you could have recently moved countries and still be using the phone number that you got in your old country. But many people will probably use their actual number and of those people most probably have a number from the country they are living in.