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There's nothing on there worth compromising, will it be overall less snappy with worse battery life?
 
There's nothing on there worth compromising, will it be overall less snappy with worse battery life?
I would say you will notice a difference in performance and battery life. There are many that say it works well considering the limitations of the hardware (it is a device that was released 7 years ago). Others say it makes the phone laggy/slow and kills battery life. The problem is, once you update to iOS 15.7, you can't go back to any previous version so you'll be stuck. You need to weigh the pros and cons and make the decision. You may enjoy the new features iOS15 brings then again, they may not matter to you. You will also lose full functionality of 3D touch which has been replaced by haptic touch. Not sure if that matters to you.
 
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Performance will decrease, though not to an incredible degree like on, for example, the iPhone 4s on iOS 9 or the 5c on iOS 10 (I have it, it’s absolutely pathetic. It ruined the device).

Battery life though? It will be ruined. iOS 12 is already considerably worse than iOS 9-10. There was a sharp drop on iOS 11-12, and an even sharper drop on iOS 13-14. iOS 15, obviously, worsened it further. I’ll give you some numbers for you to consider: With moderate use and a new battery, you’ll probably get around 2.5 hours on iOS 15, at best. As an example, I have a degraded battery (65% health) on my iPhone 6s on iOS 10, and I get about 6 hours of screen-on time on full LTE. Full Wi-Fi is even better, at around 7.5 hours. iOS 12 would probably get me 3-3.5 hours at best. I reckon I’d struggle to get 2 hours on iOS 15. Raw numbers will be better with a new battery, but don’t expect a lot more than that, like I said.
 
yeah I still have my 4s with original battery... only works if plugged in. Apple should have offered some kind of compensation for that fiasco with ios9.

I've seen some of those comparison videos on youtube with the 6s on 15 against newer models and there really wasnt much difference with general usage apart from the loading of certain games which took longer to load.

I guess its the battery that's gonna take the biggest hit!
 
Looks like the 16gb 6s is the one that struggles the most... 32gig up is a lot more useable with 15?
 
yeah I still have my 4s with original battery... only works if plugged in. Apple should have offered some kind of compensation for that fiasco with ios9.

I've seen some of those comparison videos on youtube with the 6s on 15 against newer models and there really wasnt much difference with general usage apart from the loading of certain games which took longer to load.

I guess its the battery that's gonna take the biggest hit!
Yeah, performance-wise it will be usable. Forget about any half-decent battery life, though, even with a new battery. Thing is, you can’t go back. Once you update, the 6s will be on iOS 15 forever.
 
Yeah thanks , only thing is amazon and ebay download older versions that then prompt me to upgrade to the latest versions then shutdown.
 
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used a9 iPhones on iOS 15 and always had a bad time. iOS 12 was great tho, so you should probably stay with it. I still consider iOS 12 to be the best performing iOS version of all times.
 
Yeah thanks , only thing is amazon and ebay download older versions that then prompt me to upgrade to the latest versions then shutdown.

How many more apps will do the exact same thing or just not work at all?

Upgrade.
 
I updated my 6S to 15.7 and although it is a bit laggy in places, it's not a travesty (e.g. IOS 7 on iPhone 4, OMG.)

Keep 12 until you can't bear it anymore, than update I suppose.
 
Yeah, think I'll stay on 12 for a while.

If I do upgrade I will make sure it's a full erase and restore from itunes.
 
Unless you need up to date apps, stay on iOS 12... What is the exact version?

With the recent iOS versions, I have decided that the 3rd version compatible with the device [like iOS 9 for iPhone 5s or iOS 10 for iPhone 6] should be the version you stay on... For iPhone 6s, since iOS 11 is slow and buggy, stay with iOS 12 since that is what is currently on your device...

I have iPad 9 on iPadOS 15.5 and iPad 6 on iPadOS 13.7 at the moment and once iPadOS 16.1 gets released I'll upgrade the iPad 9 but keep the iPad 6 on the version currently installed on it since upgrading it to iPadOS 15/16 may slow it down compared to its current performance... Also, iOS 13 and iPadOS 13 are the last versions without the widgets showing with the app icons...
 
version is 12.1.4 what it shipped with. Which is probably buggy lol

I managed to try out a 6s plus with 14.8 on it and i couldn't see much of a difference in performance compared to 12.
 
After having the used iPhone 6S in for battery replacement 2 years ago, I've installed betas on it all the way from iOS 13 to the latest - iOS 15.7. I've toyed with it once in a while just for fun. The performance is still snappy. Battery health only lost 2%. Too bad Apple decided that iOS16 are for iPhone 8 and up. I guess I'll keep toying around on my iPhone 6S until it gives up its ghost.
 
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