Maybe this will become harder soon when phone companies are required to verify the call back number? https://www.fcc.gov/call-authentication https://www.fcc.go

Maybe this will become harder soon when phone companies are required to verify the call back number? https://www.fcc.gov/call-authentication https://www.fcc.gov/call-authentication https://docs.fcc.gov/public/attachments/DOC-363399A1.pdf https://docs.fcc.gov/public/attachments/DOC-363399A1.pdf