The details about the multi-device feature are as follows:
-Connected devices can work without an active internet connection on the host device.
-Up to 4 devices can be connected to your WhatsApp account.
-WhatsApp will allow chat history between iOS and Android. This feature requires the app to be up-to-date.
-Multi-device feature will be available as a beta feature for those who want to try it and will be optional at the beginning.
-Audio and video calls will work on all devices.
-You cannot send messages or call contacts with an old version of WhatsApp installed.
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