Install iOS 12.3.1 If You Bought AirPods 2
If you bought a pair of AirPods 2, or you're planning to buy a pair in the near future, and you skipped iOS 12.2 and iOS 12.3, you need to download iOS 12.3.2/iOS 12.3.1.
The iOS 12.2 brought support for AirPods 2 which means your iPhone needs to be running iOS 12.2 or later in order to use them.
The AirPods 2 feature a new H1 chip that doubles talk time, makes switching between your devices twice as fast connecting to your phone to take a call 1.5x faster, powers voice activated Siri, and also helps to deliver 30% less lag when playing games.
If you're interested in buying a pair, head here for more information about Apple's new earbuds.