my dad (who was close to 90 at the time) was getting scam calls. he'd been scammed by someone who came to the house, and demanded money--and then came back, and demanded more. when stuff started on the phone, as well, we changed the number he'd had for over 50 years. he had been a brilliant mind, back in the day, but time and technology did its own scam on him. we tightened up every kind of access to him, and left written instructions by the phone--and put caller ID on his phone. it protected him until he passed away, but vigilance is the only way top protect our older family members.