Selecting country to enter your phone number

Here is an example of a dumb user interface. You can’t just enter your full phone number, you have to select a country from the list first:

It is especially tough when you have +44 number. I don’t know what to look for: UK? United Kingdom? Britain? Great Britain? England...? Even if there is a correct answer to this question, it is not necessarily the case that the authors of the form have the same idea.

To make thing worse still, it’s a custom dropdown instead of a system one, which means — of course! — that nobody bothered to implement keyboard support, so you have to scroll back and forth in this tiny area.