I'm going to echo this and add that purely numbered IDs are much easier to hear. There is tremendous aural confusion around B & D & P & T etc, even among speakers with the same accent. You might find that while 4242 4242 4242 4242 takes longer to read it's a false economy to switch it out with something like PDBT.

In reply to Re^3: Shorter ID Codes by Your Mother
in thread Shorter ID Codes by Micz

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