iphone camera icon

That depends on why it isn’t showing. There are several possibilities:

• You inadvertently moved it into a folder. Open Search (drag down from the middle of the screen) and search for “camera”. If it’s in a folder the camera icon will appear under ‘Applications” and the folder name will be next to it.
• You inadvertently moved it to another page of the Home screen. From the search; if it appears at all it is on another page of the Home screen. Just look for it.
• For either of the above, you can go to Settings/General/Reset - Reset Home Screen Layout. This will put all of the built in icons back where they started, and organize your added icons alphabetically.
• If it doesn’t appear in Search, go to Settings/Screen Time, tap on Content &Privacy Restrictions, then Allowed Apps, and turn on the switch for Camera.
• If the switch for Camera was already on, but your phone is under either Company or School Management or has a company email account the administrator has the option to disable pretty much any function.