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A poll of 3,755 people by the consumer magazine 60 Millions de Consommateurs found 47% felt had made no difference. The site’s 3million subscribers have registered more than 7m phone numbers but only 15% of those polled said they felt calls had reduced.

Many said it was too difficult to give Bloctel details of callers – but Bloctel say it can only improve if more pest numbers are reported.