Enter your phone number (with area code) and then click "Check".

A phone number consists of a three-digit area code followed by a three-digit exchange followed by a four-digit local number.

Variations are to permit the area code to be with parenthesis, e.g. (905), and to permit any of the characters ' '(space), '.' or '-' to separate the three parts, e.g. 123 456 9876, but the same character must be used in both places.