I set up BT Call protect with Call Minder on my Dads after he got taken in by a scam call and after asking for advice on here. It's great - I've set it on 24/7 Do Not Disturb so only numbers I say are VIP get through . All other numbers have to leave a message on 1571. I've set up a PIN so I can dial in remotely to hear any messages and I can look online and see a list of all calls made to him. I'm lucky that he's far enough along that he doesn't have a clue so he'd never know to ring 1571 or check messages etc etc . It's such a relief as it wasn't just scammers I was worried about he was also getting calls from other people and promptly forgetting them! I think it's £5.80 a month but for me it's worth it for peace of mind.