I ordered the mobile phone on 27.5.2020. It was delivered with an OS version 12.
The phone has wifi.
At first Whatsapp was not displayed in the store.
And update was also not possible.
You have to switch off the phone and restart it then version 17 was displayed for download.
As far as I know, Whatsapp is available with an OS version 16 or higher in the kaiOs Appstore.
Would love to answer the question, unfortunately I have no idea what OS version is on the phone. for me the phone is just fun to look at, and it is 4G capable.