WhatsApp officially discontinued support for the BlackBerry OS, including BlackBerry 10, as of December 31, 2017. However, there is a workaround that can help you download and install WhatsApp on your BlackBerry device, although the method might not be completely safe or reliable.
Please note: Attempting to install WhatsApp from third-party sources could potentially harm your device or compromise your data security, and is not officially supported or recommended.
If you choose to proceed, here are the steps:
Check Compatibility: Make sure your BlackBerry device is compatible. It should be running on BlackBerry OS 10.3.2 or later.
Enable Installation from Unknown Sources: Go to your phone's Settings > App Manager > Install Programs > Turn on 'Allow Apps from Other Sources to be Installed'.
Download WhatsApp APK: From your BlackBerry browser, visit a trusted APK download site (for example, APKMirror). Search for 'WhatsApp APK for Android'. Make sure to download the latest version.
Install WhatsApp: After the APK file is downloaded, open it from the Downloads list in your device. Tap on 'Install' to install the app.
Set Up WhatsApp: Once installed, open the WhatsApp application. Agree to the terms and conditions, and proceed with the verification of your phone number. After successful verification, you can set up your profile and start using the app.
Remember that since WhatsApp no longer supports BlackBerry, certain features may not work as expected, and the application may stop working entirely at any point.
For the best and most secure experience, it's recommended to use WhatsApp on supported operating systems, such as Android and iOS. The app will work better, and you'll be able to enjoy all the new features and updates.