Depending on the phone and carrier. I have sprint and a Iphone. I can go to print website and sign on and go to your preference and you see how to block it you will add the number to a block log. On the phone I go to the recent call list there is a i(for information ) click on that scroll down and it will say block number.

This is a Verizon wireless number they never leave a voice mail and when you call back you find out its a Verizon wireless number.

This number has called numerous times and there is no answer when I pick up.  How do you block a call like this from a cell phone?

This number from santa anna ca. This is land line.

They called twice, I did not answer, they left no message.