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Got a smart 'phone never bothered by these callers at all. Got rid of my landline years ago, that was something I couldn't protect from these companies, the only problem I used to have was filling in forms, they always insisted on a landline number, so I would put my old disconnected number in that slot and only add my mobile number IF I thought it would be of use to me to have them ring me.

If you take care with who gets your number or email address that solves at least half the problems caused.