Yes and no. The problem is that if you make a call from AT&T then AT&T knows you made the call. But AT&T also has to treat calls from other carriers - includi

Yes and no. The problem is that if you make a call from AT&T then AT&T knows you made the call. But AT&T also has to treat calls from other carriers - including carriers from other countries - as valid phone calls, without knowing if the information provided by the other carrier is accurate. Most of these spam factories are based offshore in countries with lax regulations. Others use legitimate services like Twilio to launder their calls so you have to subpoena their carrier, then subpoena Twilio only to find out that the call is coming from a country or jurisdiction where what they're doing isn't illegal. It's a slow and painful process to track these scammers down.