We use E.164 international phone number formatting for all phone numbers.
More info about this format:
wikipedia
This phone number format is internationally recognized standard.
E.164 phone number format contains:
[+][country code][area code][local phone number]
- + - plus sign
- country code - international country code
- area code/national destination code - code without leading 0
- phone number - local phone number
Here are some examples:
List of international country codes:
wikipedia
