The silent number won’t stop them all as some of the call centres use number generators but our cold callers have dropped to about 1 per 2 months. The biggest thing to remember is never ever use your phone number in any competitions or surveys.
The link following is a post I made some time ago:
If you don’t have a mobile just buy yourself a cheap one at Coles or similar for using as per the instructions in the link above. It certainly doesn’t need to be a smartphone so should only cost $30 or so to get one.
