WhatsApp’s multiple device support is going to sync your chat history across platforms
WhatsApp is working on the feature that allows you to use the same account across different devices at the same time. The messaging platform has worked on a single device all this time and reports have it that this new feature is being worked on in parts.
As and when the feature rolls out, users should be able to use WhatsApp across four different devices at the same time. WhatsApp is working to create an interface on the Android app and on WhatsApp for iOS.
When a user wants to use WhatsApp on a second device, there is that issue of copying the chat history. For this, WhatsApp will require a WiFi connection since it may use a large amount of your data plan.
Once you are connected to the WiFi network, the login process will begin.
WABetaInfo reports that WhatsApp Desktop was used for the test here but it will work on a second mobile device too. It is possible that WhatsApp will allow other mobile devices to be connected to your main device slightly later than WhatsApp desktop. Using this feature, Internet connection on your device will not be needed to WhatsApp Desktop.