I mostly use an old phone on 16.6. iOS 17/18 is harder; you can jailbreak that if you have an iPad 7th Gen (technically iPadOS, but whatever). I have a couple but prefer the iPhone since it's less clunky to lug around!

I've seen some rumors of that device not supporting iPadOS 19, so I'm not really sure what the plan is if that's true. Maybe everyone starts forking money over to Corellium.