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Downtime likes nothing more than chatting to double-glazing salesmen and call centre workers, but it seems others do not feel the same.
Two British inventors who fall into the latter category have invented the Truecall device, a neat gizmo that acts as a buffer between your phone and the outside world.
It works by identifying the genuine calls of family and friends, and filtering out nuisance calls.
Downtime’s alternative, low-tech filtering service involves a four-year-old picking up calls and repeatedly saying “poo” to callers whose identities are not recognised.