If you have an iPhone 6s or newer, your phone is compatible with iOS 15 and you should have the latest version, iOS 15.6.1. Likewise, if you have a 5th-generation iPad, 4th-generation iPad mini, or 4th-generation iPad Air, you can run iPadOS 15.6.1. But those with iPhones and iPads older than that are stuck on iOS 12, which doesn't get regular updates. Every so often, though, Apple issues an update to this years-old operating system with critical security fixes. Some security issues are so important that it's urgent to get them out, even to the few users still hanging on to iPhones or iPads from more than six years ago.

https://www.macworld.com/article/919248/got-an-older-iphone-or-ipad-get-ios-12-5-6-today.html

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