You can update the iOS operating system (iPhone) by following these steps:
⚠Note: Please ensure you are connected to the Internet via Wi-Fi.
1. Open Setting.
2. Click on General.
3. Click on Software Update.
4. Click on Install Now.
5. Enter an access code.
⚠Note: If you want to learn more about updating your operating system to the latest version, you can visit the iOS Help Center.