Peace at last. After scanning all call blocker devices, I decided on the CPR Callblocker as the best value for money. What a brilliant choice I made. ( It does exactly what it says it will do ) I was receiving on average an international call each day and on bad days up to three calls a day. So far, I have only needed to "zap" one call in the first two weeks, but I know from the caller display that I have had eight calls that have been blocked,so clearly the preprogrammed numbers are doing their job. One very happy customer.