If your device was activated before , and you still have access to the app store, this is the safest way to install it:

Installing WhatsApp on a Jio Phone running KaiOS 2.0 or 2.5 can be tricky because official support for the platform has recently ended. While many users look for "APK" files, it's important to understand that , as those are for Android. Instead, KaiOS uses a different app format based on HTML5 and JavaScript. Official Installation Method

Make Online Phone Calls in 3 Steps
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Go to the Free Calls
You can directly access our application website through a browser, without downloading any plugins or applications, to perform quick calling functions.
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Log in to your account
Log in to your account. If you don't have an account, you can immediately create a new one to use the dial-up service.
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Keyboard dialing
Select the region of the called party and click on the dialing keyboard to make the call.
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