Determine your current device software version and check for updates.
INSTRUCTIONS & INFO
VIEW SOFTWARE VERSION: Swipe down from the Notification bar with two fingers, then select the Settings icon. Note: The images and steps in this tutorial reflect the latest software version (Android 7.0). For more information on the latest update available for your device, check att.com/softwareupdates.
Select the General tab, then scroll to and select About phone then select Software info.
Here you can view the Android version, Baseband version, and Software version.
CHECK FOR SOFTWARE UPDATES: From the About phone screen, select Software Update.
Select Update now. Note: If an update is available, follow the on-screen instructions to perform the update. If an update is not available, select OK.