Call blocker (Stanwell Village TW19)

Bought a few years ago, but has never been used. I believe it’s for use with land line. Would be useful for someone who does not regularly use a mobile but is bothered by nuisance calls on land line . Eg an elderly relative.
Thks for reading

Fair Chance Policy: I’ll wait before choosing a recipient to give more people a chance to reply.
Collection Times
In most days by arrangement.

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