We use the Panasonic's number blocking in addition to the Digit One call blocker. It just doesn't have the capacity of the Digit One though. And, it can't block calls by CID name. 95% of the unwanted calls I get are "Out of Area" and "Not Provided". I can block those two "names" on the Digit One, and that blocks all the neighborhood spam calls. Those neighborhood spam calls never repeat the same number and exchange, so they are virtually impossible to block individually.I just buy Panasonic wireless phones that come with call block feature. Works fine for me without 3rd party or provider services. This way I can screen the calls myself before I add to the block list. I buy my phone's at Sam's Club