When you save an unabailable number, it will put the 11 numbers in you phone book, becuase unavailable is 11 numbers. The 11 numbers are the numbers on the keypad that go with the letters U*N*A*V*A*I*L*A*B*L*E
this is a number in the UK. It has been calling my cell phone and we can't block it. I accidentally picked up when they called and all I got was a "BEEP". I went to Verizon and had them document the call just in case anything happens with my number. They said it shouldn't, but documented it anyways. I then saved the number and titled it "don't open" and set the ring tone to a single beep. That way it is not annoying.