in lib/facebook_ads/ad_objects/server_side/util.rb [238:257]
def self.is_international_number?(phone_number)
phone_number = phone_number.gsub(PHONE_NUMBER_DROP_PREFIX_ZEROS, '')
if phone_number.start_with?('0')
return false;
end
if phone_number.start_with?('1') && US_PHONE_NUMBER_REGEX.match(phone_number) != nil
return false;
end
if INTL_PHONE_NUMBER_REGEX.match(phone_number) != nil
return true;
end
return false;
end