Am I right that cell phones will accurately display the calling number? If so, would it be helpful to collect those calling numbers, on the assumption they're using the same phones for robocalling landlines as well?
ankh wrote: ... cell phones will accurately display the calling number?
Only to the extent that the accurate CID is provided to the cell carrier. That's the same challenge that landline carriers face. Unfortunately, the protocol used to transmit CID (SS7) was developed long before VOIP was developed, and it never considered that calls would be injected into the PSTN from non-telco entities.
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