I've tried to do it through VCDS, found the string (can't remember where it is...) but it asks for the new number in 16 digit hexadecimal or something, but it didn't accept the Australian toll-free number as a replacement value. I gave up after about 5 minutes, but I'm happy to go hunting for the location again if someone else wants to play with it 
edit: after reading the OP again, maybe we could all just copy the coding that's on his Passat if you can organise to hook it up to a laptop?
Golf R - 5dr Rising Blue, DSG
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