It seems ##634# is a universal dialer code to get to the secret developer menus on Windows Phones, buts its only on the Samsung Focus that it does anything useful.
On the Dell Venue Pro however it does demonstrate that Dell has a wicked sense of humour.
Richard, who tried out the code, wrote us, saying:
Saw the article about tethering the Samsung Focus…made me try ##634# on my Dell Venue Pro, which instead displays a Matrix screen…interesting Easter Egg.
Very cool Dell, but I think we would have preferred USB tethering also â€“ but who knows, maybe it is there if you are The Oneâ€¦.
Thanks Richard for the tip.