E.164 format

E.164 defines a format for international telephone numbers. Numbers are usually prefixed with the plus sign (+), include the international country calling code and are limited to a maximum of 15 digits.

Phone numbers include:

a + sign to indicate that the number is international
a country code, such as 44
a region code, such as 1234 (remove any leading digits, usually a zero, if applicable)
the subscriber number, such as 567890

Example telephone numbers in national and E.164 format

Country	National format	International format
UK	02072068888	+442072068888
Australia	0285993444	+61285993444
US	6463624888	+16463624888
Belgium	027933835	+3227933835
Ireland	015530073	+35315530073
Finland	0974790184	+358974790184
Norway	21953282	+4721953282
France	0170377180	+33170377180
Austria	01253010376	+431253010376
Netherlands	0207085097	+31207085097
Sweden	0850513830	+46850513830
Luxembourg	27860726	+35227860726
Denmark	32729282	+4532729282
Poland	221288260	+48221288260