Existing installations likely show an "obsolete" message and prevent messaging.
If you’re choosing a used phone for WhatsApp only, the running stock KitKat 4.4.2 offers: whatsapp android 442 top
: Older systems like 4.4.2 do not receive the latest security patches from Google, making them vulnerable to modern online threats. Existing installations likely show an "obsolete" message and
Support for Android 5.0 and 5.1 officially ceased on September 8, 2026 . whatsapp android 442 top