I have managed to block all nuisance calls on my cell phone. I went to Settings and set my phone to accept calls only from people already on my contact list between the hours of 12:01 p.m. and 11:59 a.m. It works like a charm. Unaccepted calls are listed on my recent calls list, so I can check them out and find out if it's someone I want to hear from. Try it; you'll like it! You're welcome!