system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: how does the Scam Likely feature on a cell phone work?

How does the phone know when an out of state number is a scam versus just someone calling you?
gpt
STIR is being implemented for mobile devices that are allowed to make calls over 4g, providing a way to verify whether a call originating form a VOIP system such as another cell phone actually has the right to use that Caller ID number, or whether it is likely falsified.