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You have received quite a range of responses. Part of the reason for that is because in the earlier days of Apple OS versions problems with new OS releases were very common. So each of us developed his or her own different protocol for coping with OS version evolution. It is 2025 now and Mac OS, iOS, etc. OS versions have become relatively much less problematic immediately upon release.

As to your specific query, seven years is the most common time frame referenced for complete OS support; however security updates often go for years beyond that [e.g. now i see it's comment about iOS 15 above], but there is no guarantee that will happen.
There are a few specific edge cases in the Photos app related to batch applying of edits to many high-res photos that I found broken in iOS 16 and 17 but actually fixed in iOS 18. This is one of the reasons I am really quite wedded to it.
 
iOS 15 recently got a security update June 2025
But only for devices not able to run iOS 16 or newer. You aren’t able to install that version on an iPhone XR for example, as iOS 15.8.4 (from June 2025) is only available for iPhone 7 and below.

On any device capable of running iOS 16 (like the iPhone XR for example), even if it would run iOS 15.0, you would be offered iOS 18.5 as the only option. There’s no way to update to 15.8.4.
 
I'm thinking of staying on iOS 18 instead of updating to iOS 26 later this year. I really like the iOS design and the functionality is super solid for me.

Is this an easy thing to do on my iPhone 16 Pro and how long do you think I'd still get security updates for the older OS?
If it’s like previous years, you’ll get security updates until around November, after which Apple assumes that iPhones supporting iOS 26 should upgrade to it as they think it’s mature enough (i.e. 26.2 or so). Only iPhones that don’t support iOS 26 will get further security updates for iOS 18.

That being said, I’m still on iOS 17.7, as that’s my current preference over security updates. I tend to upgrade only every other year, on average.
 
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iOS 12 was the oldest release that still received updates. The last update iOS 12.5.7 was released 23 January 2023, which is more than 4 years since iOS 12 was released back in 2018. It was the latest update for iPhone 5s and iPhone 6 (speaking of iPhones only).

iOS 15 was the second oldest released that still received updates. The last update iOS 15.8.4 was released 31 March 2025, which is more than 3 years since iOS 15 was released back in 2021. It was the last update for iPhone 6s, iPhone SE 2016, and iPhone 7.

iOS 16 was the last major update for iPhone 8 and iPhone X and still received updates. The last update 16.7.11 was released 31 March 2025, which is more than 2 years since iOS 16 was released back in 2022.

iOS 18 is the last major update for iPhone XR and iPhone XS and is still receiving updates. The last update for iOS 18 should be around late 2028 or early 2029.
 
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iOS 18 is the last major update for iPhone XR and iPhone XS. The last update for iOS 18 should be around late 2028 or early 2029.
When the EU pressured Apple to put a time table on their support, Apple committed to 5 years of updates for the devices. That means Apple is already past when they need to provide ANY updates for the XR and XS. They certainly may, but it's a gamble to just assume you will get anything past the 18.6 currently in beta.
 
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But only for devices not able to run iOS 16 or newer. You aren’t able to install that version on an iPhone XR for example, as iOS 15.8.4 (from June 2025) is only available for iPhone 7 and below.

On any device capable of running iOS 16 (like the iPhone XR for example), even if it would run iOS 15.0, you would be offered iOS 18.5 as the only option. There’s no way to update to 15.8.4.
Yeah, which makes it a moot point in this case. If OP stays behind, then they can’t install any updates, security or otherwise. I’m running iOS 12.3.1 on my iPhone Xʀ and I can’t update to… what’s the latest version? iOS 12.5.7? It just forces me to iOS 18.5, which makes security updates irrelevant for those that don’t want to run the latest major version.
 
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If the new iOS 26 design isn't an issue for you I don't see why you're hesitating to upgrade your 16 Pro. Personally I'll hold off upgrading until 26.3
 
OP it’s too early to worry about upgrades or make a decision. iOS 7 had major UI changes and every one was panicking in first two beta cycles. I upgraded when Apple released iOS 7.1. You will get enough time to decide if you want to stay put or upgrade
 
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For the first time, I'll probably go that route too and update to iOS / iPadOS 26 only when it'll be the default update path. Not that I don't like the new design, but iOS 18 run perfectly on my 16 pro max with excellent battery life too. And on my M4 iPad pro, not only I have very good battery life, but the loss of slide over is a big turn off for me and don't want to update for that reason as well.
 
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For the first time, I'll probably go that route too and update to iOS / iPadOS 26 only when it'll be the default update path. Not that I don't like the new design, but iOS 18 run perfectly on my 16 pro max with excellent battery life too. And on my M4 iPad pro, not only I have very good battery life, but the loss of slide over is a big turn off for me and don't want to update for that reason as well.
iOS 18 just feels like one of the really solid versions of the OS. Having a good solid platform actually rocks.
 
I’m running iOS 12.3.1 on my iPhone Xʀ and I can’t update to… what’s the latest version? iOS 12.5.7?
Even if you updated when iOS 12 was still receiving updates, the latest you can update to is iOS 12.4.1 while iOS 12.4.2 and later were only for iPhone 5s and iPhone 6s [limiting the discussion to iPhones only]

iOS 18 run perfectly on my 16 pro max with excellent battery life too.
Of course, since iOS 18 is designed with iPhone 16 Pro and iPhone 16 Pro Max in mind. iOS 26 [supposed to be iOS 19] is designed with iPhone 17 Pro and iPhone 17 Pro Max in mind. Most of the features in iOS 26 will be available to iPhone 15 Pro and newer while iPhone 15 and older will just get some of the features.
 
Even if you updated when iOS 12 was still receiving updates, the latest you can update to is iOS 12.4.1 while iOS 12.4.2 and later were only for iPhone 5s and iPhone 6s [limiting the discussion to iPhones only]
Exactly, which makes, like I said, longer-term security updates irrelevant. Even if Apple guaranteed 10 years of updates, they’d never allow you to install the latest security update for the current major iOS version.

I guess they could do that and only sign OTA releases, I don’t know whether that’s possible, but they have exactly zero interest in encouraging anyone to stay behind, as evidenced by their uncrackable, decades-old resolve to disallow downgrading.

I’ve never understood the logic behind that, because even if it were security, you could just release security updates for, say, every iOS device on every iOS version until they’re officially classified as obsolete, and by then you could let users pretty much install whatever they want.

Since they have to know that iOS updates impact performance and battery life, if they really cared about long-term software quality they wouldn’t keep deprecating older iOS versions.

Developers and their pathetic obsession with dropping support for older iOS versions as fast as possible doesn’t help either.

The iPhone 11 on iOS 18 has worse performance (not too bad, but I’ve found some lag), when compared to iOS 14 and 15, but battery life is still-like new. I updated one from iOS 14 to iOS 18 and found no difference - in fact, iOS 18 was slightly better.

iOS 26 and its Liquid Glass makeover will possibly end that, however.
 
And on my M4 iPad pro, not only I have very good battery life, but the loss of slide over is a big turn off for me and don't want to update for that reason as well.
I am almost positive that slide-over and simple split-screen multitasking will come over from iPadOS to iOS if we are going to get a foldable phone in 2026. (Unless all we get is a flip and a true folding tablet-style phone is still another 1-2 years away.) Maybe by iOS 27-28, you will have a choice on iPad.
 
I am almost positive that slide-over and simple split-screen multitasking will come over from iPadOS to iOS if we are going to get a foldable phone in 2026. (Unless all we get is a flip and a true folding tablet-style phone is still another 1-2 years away.) Maybe by iOS 27-28, you will have a choice on iPad.
Call it ridiculous if you like (because I think that perhaps it is), but I am actually a massive fan of the original Slide Over method back with iOS 9, of the app selector on the side.

Sadly, I lost the only iteration of that I had, and unwillingly, as Apple forced my 9.7-inch iPad Pro out of iOS 9 and into iOS 12 in 2019. The A9 Activation Bug on iOS 9 is one of Apple’s worst software fiascos ever.

I wish I still had that iPad on iOS 9. I have and it still runs iOS 12, but it isn’t the same.
 
The A9 Activation Bug on iOS 9 is one of Apple’s worst software fiascos ever.
I don't know how this iPhone SE 2016 was set up, whether the Apple ID or Apple Account was used during set up or only after fully set up and the Apple ID or Apple Account was only used on the App Store, but this video seems an exception of iOS 9.x not activated on A9 devices, although the oldest version for iPhone SE 2016 is iOS 9.3


I have no experience of iOS 15 running on iPhone 13 or 13 Pro [although I have used iOS 15.x on iPhone 7 Plus] but it seems that the customization introduced in iOS 16 seems to have started the decrease in quality and stability of iOS updates.
 
I don't know how this iPhone SE 2016 was set up, whether the Apple ID or Apple Account was used during set up or only after fully set up and the Apple ID or Apple Account was only used on the App Store, but this video seems an exception of iOS 9.x not activated on A9 devices, although the oldest version for iPhone SE 2016 is iOS 9.3


I have no experience of iOS 15 running on iPhone 13 or 13 Pro [although I have used iOS 15.x on iPhone 7 Plus] but it seems that the customization introduced in iOS 16 seems to have started the decrease in quality and stability of iOS updates.
iOS 9.3 was also affected - I had a 9.7-inch iPad Pro on iOS 9.3.4 and an iPhone 6s on iOS 9.3.3 - both have been forced out.

The decrease in quality has always been there, and, if anything, it’s better now. I tested an iPhone 11 on iOS 14.6 vs iOS 18.4.1, like I said earlier, and battery life was like-new. Performance is unclear, but I saw massive lag in the Apple Music app, which wasn’t there on iOS 14 or 15. But crucially, 64-bit devices had their battery life obliterated with enough updates (The 7 Plus on iOS 15 should have far worse battery life than iOS 10), but that said, it’s not the end for the 11 yet. iOS 26 and its redesign may prove too much for the 11, too.

I have no other direct comparisons, as my own personal tests with devices updated through many major versions have a jump, from A9 devices on iOS 13 to A13 devices on iOS 18. A9 devices were significantly affected, both the 6s on iOS 13 and the 9.7-inch iPad Pro on iOS 12. A13 devices seem fine up until iOS 18.

My iPhone Xʀ is on its original iOS version, my iPhone 8 runs iOS 14, I no longer have my 7+, but it always ran iOS 10, and my iPad Air 5 runs iPadOS 15.
 
The decrease in quality has always been there, and, if anything, it’s better now. I tested an iPhone 11 on iOS 14.6 vs iOS 18.4.1, like I said earlier, and battery life was like-new.
Surprising but it makes sense I suppose. The jumps between hardware have gotten smaller so naturally a new OS should be more friendly to older devices than in the past.
 
Surprising but it makes sense I suppose. The jumps between hardware have gotten smaller so naturally a new OS should be more friendly to older devices than in the past.
Yeah, I think I that’s definitely part of it. I always guessed that this was the solution.

Make devices powerful enough and with enough initial battery life so that any updates-induced drops become inconsequential.

This wasn’t the case for A9 devices, even though the jump in performance was massive at the time, and people speculated about it. I speculated about it. And they ended up being massively affected.

Still, like I said, it isn’t over. iOS 26 hasn’t officially debuted, the impact it may have on the iPhone 11 is still to be determined.
 
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The XS will no longer receive updates, the same goes for the XR.
This post is referring to security updates, not major version updates. Apple will likely continue to release security updates for iOS 18 for years to come as they did with previous iOS versions such as iOS 15 or 16.
 
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