TelPal&reg; Lastest Version Call Blocker Pro For Landline Home Phones With 3 Line Caller ID Displays And 1500 Capacity,Block All Spam Calls,Hidden Calls,Area Spam Calls It is the latest Version for Call Blocker Pro; Hidden numbers, private and unavaialble call numbers can be blocked. High Volume Blocking Capacity: BLACKLIST up to 1,500 unwanted phone numbers, area codes and prefix numbers. One-touch Block:Its easy to install & use  simply setup and start blocking numbers! Compatible with Existing Phone Services:It works on landlines (PSTN, POTS), Analog/Digital/Internet (VOIP) Voice lines;Attention: Not Compatible with Cordless Phones & Two Line Phone systems, especially AT&T Phones !! Great Relief from Unwanted Callers; Getting Quiet and Giving us Back OUR Phone! No Batteries or External Power Required.This device is an annoyance-blocker, worth every cent