> banks of cell phones This will cut down on spam calls considerably. Right now callers spoof their phone number each phone call. Like this: Call 1: 555-1212

> banks of cell phones This will cut down on spam calls considerably. Right now callers spoof their phone number each phone call. Like this: Call 1: 555-1212 Call 2: 555-1213 Call 3: 555-1214 Under the new system adding the spam number to a blacklist will actually result in those calls being blocked as they will change far less frequently. It's not perfect but it will largely accomplish what you say here, as callers will have to buy new sim cards and swap them out in order to avoid blocklists.