WhatsApp uses a "keep and ahead" system for exchanging messages amongst two buyers. Whenever a user sends a information, it's saved over a WhatsApp server, which attempts to ahead it towards the addressee, and continuously requests acknowledgement of receipt. After WikiLeaks introduced the 1st installment of Vault seven, "Year Zero", https://sites.google.com/view/ayurvedic-supplements-online/cureayu-natural-healthcare-solutions