Get the YOUMAIL app and all of your calls can be not only blocked but will receive a message saying your phone has been disconnected and then it will disconnect the caller. Works great, I've had it for years and I just now blocked THIS number. They won't be calling me anymore.
Called, caller ID said Local with this phone number. I did not answer, they did not leave message on answering machine. I'm assuming it was an unwanted call. I've found that genuine calls either leave a message or have identifying caller ID with an actual name, not just Local or Private Caller or Out of Area or such.