How to view & update your OS version
iOS devices
Open the Settings app.
Tap General.
Tap Software Update.
If an update is available, tap Download and Install.
Android devices
Steps may vary slightly by brand (e.g., Samsung, Google Pixel), but generally:
Open the Settings app.
Scroll down and tap Software Update or System > System update.
If an update is available, follow the prompts to download and install it.