Change default iPhone and iPad apps under Settings > Apps > Default Apps. Options include browsers, messaging, contactless ...
Unless you've gone looking in System Settings, you may not be aware that the Camera Control button on the iPhone 16 and iPhone 17 can be set to do other functions besides set up and take a picture.
If you can’t see all of these settings on your iPhone, that’s because you haven’t got a Pro model. The full camera settings ...