You can now choose WhatsApp as your iPhone’s default app for calls and text messages, as noted by WABetaInfo. After updating ...

To add your app icons, simply click on iMessage App Icon in the sidebar of Xcode and you ... You should absolutely try to include a few screenshots. By default, you do not need to create screenshots ...

If you haven't used it before, you'll need to enable the iMessage extension from app drawer by taping on the App Store icon (you can choose your favorite app shortcuts in the "more" menu.) ...