Dave
M here Robin
Actually it's 553 as we've already established that 5000 (the switchboard) doesn't get you there. 5001, 5010, 5100, 5111, 5200, 5222, 5300, 5333, 5400, 5440, 5444 are also no good so there's a few free ones to start him off.
This is called
Number Mapping
and while not easy (it can take a while) can get you there in the end. The Lord helps those that help themselves.
Who else is gonna do it for him - YOU !??