Phone numbers
Best practice for formatting phone numbers that will work with most mobile devices, skype and similar software that can perform telephone calls.
Recommended formatting:
Norwegian numbers
+[[Country Code]]<space>[[Number]]
8-digit number
+47 12345678
5-digit number
+47 12345
3-digit number
3-digit numbers are not reachable outside of Norway, therfore the recommended format on 3-digit numbers are:
[[Number]]
123
International numbers
For international numbers you may use prefered local formatting, but you should try to set it up in following format:
+[[Country Code]]<space>[[Number]]
Examples:
+44 2036080581
+372 6401163
+41 796148980
Accepted formatting
Norwegian numbers
8-digit numbers
+47 12345678
+47 12 34 56 78
+47 123 45 678
+47 1234 5678
(+47) 12345678
(+47) 12 34 56 78
(+47) 123 45 678
(+47) 1234 5678
12345678
12 34 56 78
123 45 678
1234 5678
5-digit numbers
12345
12 345
+47 12345
+47 12 345
(+47) 12345
(+47) 12 345
3-digit numbers
123
International numbers
Supports local fomatting and extentions
(+12) 1234 567
+12 12 34 56 78
+12 (0) 123-45678
Not accepted formatting
Norwegian numbers
Grouped numbers are not supported
Example: 12345678 / 12345678
Alternative numbers(Telephone, Fax, Telex, Mobile) are not supported
Example 12345678 / 12 / 34 / 56 / 78
Extentions are not supported
Example: 1245678-12
International numbers
Grouped numbers are not supported
Example: +12 12345678 / +12 12345678
Alternative numbers(Telephone, Fax, Telex, Mobile) are not supported
Example 12345678 / 12 / 34 / 56 / 78
Sources for building best practice on phone numbers:
http://www.itu.int/rec/T-REC-E.123-200102-I/en
http://publications.europa.eu/code/en/en-390300.htm