Specify mobile telephone numbers

Updated: August 27, 2013

Applies To: Windows 8, Windows 8.1

Telephone numbers must be specified in ITU E.164 format. SMS clients are encouraged to store telephone numbers in ITU E.164 international format and use a library to convert ITU E.164-format telephone numbers into a regional, common written format.

The following table is an example:


Region ITU E.164 international Common written format

United States of America


(555) 123-4567

SMS short codes

SMS short codes that have short phone numbers that are four to six digits long and are typically used to communicate with automated mobile network operator services are supported.

See Also