PhoneNumberFormat

INTERNATIONAL and NATIONAL formats are consistent with the definition in ITU-T Recommendation E.123. However, we follow local conventions such as using '-' instead of whitespace as separators. For example, the number of the Google Switzerland office will be written as "+41 44 668 1800" in INTERNATIONAL format, and as "044 668 1800" in NATIONAL format. E164 format is as per INTERNATIONAL format but with no formatting applied, e.g. "+41446681800". RFC3966 is as per INTERNATIONAL format, but with all spaces and other separating symbols replaced with a hyphen, and with any phone number extension appended with ";ext=". It also will have a prefix of "tel:" added, e.g. "tel:+41-44-668-1800".

Note: If you are considering storing the number in a neutral format, you are highly advised to use the PhoneNumber class.