I became tired of blocking so many numbers.  Now I just don't answer my land  line.  In fact I have the ringers turned off.  I check every day, but very seldom do I get messages or call that I want.  And yet I pay for this phone and  feel I can't even use it.  Also had this same land line number for almost 60 years so won't change it.  A friend changed her phone number and ended up getting even more unwanted calls.