You can now choose WhatsApp as your iPhone’s default app for calls and text messages, as noted by WABetaInfo. After updating WhatsApp to version 25.8.74, you’ll see the app appear as an option in your Messaging and Calling default app settings.

WhatsApp can now be selected as the default calling and messaging app on iPhone, if users so wish (via WABetaInfo). A change in the latest

To change your default calling and texting app on iPhone, go to your settings and select Apps > Default Apps. From there, you can choose alternative apps for Messaging and Calling, and with the latest update, WhatsApp will appear as an option if you've upgraded to the newest version.