About supported operating systems
We provide support for and recommend using the following devices:
- Android running OS 4.1 and newer
- iPhone running iOS 10 and newer
- KaiOS 2.5.0 and newer, including JioPhone and JioPhone 2
Once you have one of these devices, install WhatsApp and register your phone number. WhatsApp can only be activated with one phone number on one device at a time.
Furthermore, there's currently no option to transfer your chat history from a KaiOS device to other platforms.