make use of country code

civicrm_country contains already country_code to put the phone prefix of the country.

I'd be great to use it, for instance:

on blur the phone field and the country is set to UK, verify if the phone starts with 0044 or +44
if the country is not set and the phone number starts with 0044 or +44, set the country to UK.

have a bin/updatePhone that does it automatically.

First step, populating this country_code is done (attached)