E.164 Phone Number Formatting E.164 formatting for phone numbers entails the following:
A + (plus) signInternational Country Calling codeLocal Area codeLocal Phone number For example, here’s a US-based number in standard local formatting:(415) 555-2671
** In the UK, and many other countries internationally, local dialing may require the addition of a ‘0’ in front of the subscriber number. With E.164 formatting, this ‘0’ must usually be removed.For example, here’s a UK-based number in standard local formatting: 020 7183 8750

- ### ** Help with E.164 Formatting* If you are unsure of the correct Country code, a good reference is this Wikipedia page that lists countries and their calling codes.