WhatsApp to WhatsApp will just be a data stream. WhatsApp to Phone will need to touch a phone network at some point for call completion. When you make calls fr

WhatsApp to WhatsApp will just be a data stream. WhatsApp to Phone will need to touch a phone network at some point for call completion. When you make calls from within gmail, your endpoint is a google server but google is still making a regular telephone call and just bridging the two.