A new feature, released by Beta, is accessible to everyone through the latest WhatsApp form. Open WhatsApp, navigate to Settings, tap on Linked Devices and the new option “Multi-Device” will help. I think that if you join WhatsApp Beta, you’ll be unconnected from all of your devices and need to relink. Once linked, the feature works as well as what it always has, with the exception of sending/receiving messages regardless of whether your primary smartphone is online. A message cannot be deleted from the linked device. For now, that functionality is incompatible with the primary phone called WhatsApp. Always remind yourself that you cannot message or call users who have an older version of WhatsApp from the connected devices and you can only have one primary phone connected to your WhatsApp account at once. Your primary device need to be accessed also actively. Having already taken the primary device that has been connected to WhatsApp for 14 days, then all the connected devices will automatically get unlinked. Copyright: MacRumors