International Number Format is a number format that includes the country, carrier and phone numbers without any dialling prefixes (eg 00 or 001) or special characters such as the plus symbol (eg '6427000001' not '+6427000001').

The following table shows how some numbers are displayed in international format.

Destination Prefix Local Number Int'l Format
Australia 61 0403 416 7216 614034167216
New Zealand 64 021 525 582 6421525582
United Kingdom 44 07700 954 321 447700954321
United States 1 954 555 1234 19545551234
France 33 06 87 71 23 45 33687712345

More information on Country Prefix can be found here.