We were having a very bad week with robocalls and had to unplug our phone for peace. I had reviewed several call blockers but the cell phone jammer seemed to be the best product for what I was looking for. It took less than a minute to connect it, and less than an hour for the robocalls to restart. Stopping the calls was as simple as pressing a button. We finally have peace and quite and the only calls that rings are the numbers that we have elected previously and stored. It does not interfere with any of our programed number we have stored. If you are tired of robocalls, I highly recommend this product to help restore order to your phone system. Get it, you will not be disappointed.