Install iOS 12.5.5 for These Other Changes
If you're running software older than iOS 12.4, you'll get support for HomePod in Japan and Taiwan. So if you live in one of those countries and want to use HomePod, you'll want to download iOS 12.5.5.
If you're on software that's older than iOS 12.3, you'll get some smaller changes with iOS 12.5.5 that might be of some use to you. These features include:
If you're on software that's older than iOS 12.2, you'll get some additional changes with your iOS 12.5.5 update. These include:
Apple's improved the quality of the audio messages sent in the Messages app in iOS 12.2. The company switched to a new Opus codec at 24000 Hz.
With the latest version of iOS 12 on board your device, .CAF files will also sound a lot better.
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