May or may not be aviable from your carrier
Normally, you will get notifications from OTA (over-the-air) when the updates are available for you. From here, you can open it and tap the update action to upgrade Android system to the latest version. However, if for whatever reason, it isn't being rolled out to your phone or you accidentally cleared the notification, then you need to upgrade Android version manually:
3 Methods to Update Android System Version
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