Now that you've transferred the APK file to your phone, you can install WhatsApp.
not possible to download and use WhatsApp on a Jio Phone running KaiOS 2.0 via an APK file or any other external download method. 1. APK Files Do Not Work on Jio Phones Android vs. KaiOS
| Feature | Android | KaiOS (on Jio Phone) | | :--- | :--- | :--- | | | .apk | .kpk , .zip (native) | | Runtime | Android Runtime (ART/Dalvik) | Gecko (Firefox-based) + Gaia UI | | App source | Google Play Store, APK mirrors | KaiStore (primary) | | Binary compatibility | ARMv7/ARM64/ x86 | ARMv7 (but with KaiOS APIs) |