There is no way to find out if they are coming in restricted. Depending on what phone you have ie android, iphone ect, where you can download apps. Go into your phones market and search "block unrestricted calls" basically any call that doesn't show a number will be blocked. i have it on my HTC EVO so now these blocked telemarketers ect cant contact me and i dont even know when they call lol. I hope this helps. take care..