Apple has slowly loosened restrictions on default apps for the iPhone, mostly because of the EU.
Don’t like the iPhone’s calling and messaging apps? You can now change them to WhatsApp.
After installing the latest WhatsApp update for iOS (version 25.8.74), go to Settings > Apps > Default Apps > Calling/Messaging and pick WhatsApp from the available options.
Once you make these changes, your iPhone will automatically use WhatsApp for all calling and messaging activities. For instance, if you tap the phone icon next to a business listing on Google’s search results page, the call will go through WhatsApp, not Apple’s Phone app.
