How do I put messages back on my iPhone?

The Messages app cannot be deleted since it is a part of iOS. It is probably accidentally removed from the Home Screen, however, still exists in the App Library. The App Library is the last Home Screen on your iPhone when you continue to SWIPE LEFT until you reach it. Once you are in the App Library, then you can search and find the Messages app. Once found, then you can DRAG the app out of there and place it on your favorite spot of the Home Screen.

Axel F.

Search for it on the App store and when it presets touch on download - it will probably be the cloud with the downwards facing arrow. It will reinstall.