I have a landline (or at least a VoIP version of one). The only people who have the number are may parents. And the phone company. Who seem to have no problem giving that number to all and sundry resulting in a multitude of spam calls. Which I thought was not allowed. And the do not call register takes a month before it start. At least I’ve had no-one trying to sell me double glazing, which is all I ever got in the UK; the spam calls here are far more variable.