Different phone number depending on the visitor's country?

Hi,

I am currently developing a website, no domain yet but let’s say hey.com. Totally there will be aroudn 100 pages on the site.

When one visitors visits my website from UK, I want an UK-phone number to appear. If a visitor comes from Australia I want a AU phone number to appear. That, and possibly currency, is the only thing that I want changing.

Is it necessary to create new copies of the website for that? That is, send my UK visitors to https://www.hey.com/uk, and AU visitors to https://www.hej.com/au? Or can I place some kind of widget on all pages where the concent changes depending on the visitor’s country?

Would very much appreciate any ideas of how this can easily be solved.

Best regards,
Viktor