A simple way to check if a number uses WhatsApp (WA) Messenger - then view their WhatsApp profile/message/call them. - Enter a number and check if they are using WA Messenger! - View WhatsApp profiles (if user has made visible) - Chat without saving number - message/call an unsaved number on WhatsApp (no need to add contact to message on WA) - Message myself (send WA messages/attachments to yourself by entering your own number) - Find your phone neighbor on WhatsApp - Check which of your contac