How can I make country code selection box for phone numbers like example listed

[TIMAI2]

Perhaps this may help, you would need to add the phone codes

Flags of the World

Getting and displaying flags of the world is a fairly trivial affair and can be done with blocks without too much trouble. I thought that I would have a go at an extension that contains and supplies all the current world country flags in one package. After several iterations, it seems the best solution, for on and offline use, was to convert all the flags to base64 (thanks @vknow360 for the suggestion) and store them in the extension as text. It is possible to store all the images as assets ins…

and a csv of country phone codes

PhoneCodes - Sheet1.csv (3.8 KB)