I have a Virgin Mobile Kyocera and the past couple of days I have been getting calls from telemarketers. I get about 5-6 calls a day and when they call it only rings once or twice not long enough to answer it. When I try to call the numbers back it says that There is no operator avaliable and to leave my number for them to call back.

So, is there a way to block numbers from my phone so they can't call me anymore?