1) Send a message without being noticed: This hack is available for iOS, Android, Windows and BlackBerry smartphones. The hack will allow you to send a message without anyone knowing you’ve been online. To do so, you’ll need to turn off the data and WiFi connections on your smartphone > then open WhatsApp > then type and send a message to anyone on your contact list > then close WhatsApp. The message will be sent, once you connect to a WiFi hotspot or turn on your data connection.
2) Disable double blue ticks: You can disable this feature on iOS, Android, Windows and BlackBerry smartphones. You’ll need the latest version of WhatsApp. You can find it on WhatsApp’s official website. Once you’ve finished downloading and installing the application on your device, open Settings which can be found on the drop-down menu at the top right corner > then tap Account > then tap Privacy > then uncheck the ‘Read Receipts’ box.
3) Change someone’s WhatsApp profile picture using their smartphone even if the app is locked:
This hack can be done on Android, BlackBerry, and Windows smartphones. Once you have access to a friend’s device Go to Settings and turn off the WiFi and data connection > then open File Manager > Search for WhatsApp > then tap Media > then tap WhatsApp Profile Photos > paste the picture you want into the folder and delete the old photo. Please note that the Image must be cropped to 561px X 561px dimensions for the best result.