Each new version of iOS, the operating system that powers the iPhone, brings new features, bug fixes, and changes to what the phone can do and how it's used. iOS updates can be installed wirelessly (a technique known as over-the-air, or OTA, updating).
iPhone/iPad/iPods: How to Update Software (iOS Update) via WiFi or Cellular Data
Before you start an update:
From your iPhone's home screen, tap the Settings app.
Scroll down and tap General.
