MESSAGING
Reverse-Checking a WhatsApp Match: VOIP CARRIER SIEVE
Checks a phone number's line type and routing to flag non-fixed VoIP or virtual numbers. On WhatsApp, that check has a specific, concrete angle — not just a generic application of the tool.
Why It Fits WhatsApp
WhatsApp accounts are tied directly to a phone number, so this check runs on the exact number the account itself is registered to — not a number volunteered later in conversation.
WhatsApp is a messaging app.
Checks a phone number's line type and routing to flag non-fixed VoIP or virtual numbers.
VOIP CARRIER SIEVE