Validates a single phone number

The status returned will be one of the following:

StatusDescription
OnThe number exists and the handset is currently switched on.
OffThe number exists, but the handset is currently switched off or out of range.
DeadThe number does not exist.
NotProvisionedThe number exists, but is not owned by a mobile network, for example a landline number.
BadNumberThe number does not conform to a recognised pattern or contains non numeric characters.
CountryMismatchThe number is not in a format that matches the requested country code.
ImpersonationFailedA username supplied to ValidateNumberForUserNames is not recognised.
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