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.
You can change your default calling and texting app by heading to your settings, selecting Apps > Default Apps. From there, select the Messaging and Calling options, and you’ll see a list of alternative apps you can choose from, which now includes WhatsApp if you upgrade to the latest version.
Once you change your default app, your iPhone will automatically pull up your selected app when you tap a phone number on a webpage, for example, or select the message button from your contacts list.
