How do I reinstall the WhatsApp icon that has disappeared from my phone?

If you're sure that the icon hase not been moved (and now hidden) into a folder or to a different screen, you can redownload and reinstall the app opening App Store, tapping on top right (you picture) then choose Purchased.

Regards

Giulio

If you've already searched for that icon on all screens or into all folders, search for it using Spotlight.

Put your finger on the screen on any homepage somewhere between the icons and pull down. Type WHATSAPP Into the search box.

Regards

Giulio

This does not work. Since the app is already installed it will not let you re-install it. Since I can't see the app how do I delete it?