> Their "solution" for my grandma's friend was to tell him not to have a phone for a few weeks. Isn't the better solution to just not answer any number that is

> Their "solution" for my grandma's friend was to tell him not to have a phone for a few weeks. Isn't the better solution to just not answer any number that is not a contact? Then review the voicemail if necessary. Smartphones at least often have the feature built in to forward all non-contacts to voicemail.