Me and some friends of mine, all using the SE, upgraded some weeks ago and I have to say, it works excellent on our SE 128GB.
It has gotten faster, smoother and even battery time is now better than before. At least for us.
I am VERY satisfied about IOS 12.01
Same for my iPadPro 9,7 on IOS 12.01.
edit:
I care about security and especially privacy.
As being someone often criticizing apple I congratulate apple for their efforts about security and privacy.
edit 2:
DO NOT regard the battery drain of the first days as representative for later use: Spotlight is Indexing for some days, this takes a lot of electric energy. I recommend to upgrade at the end of the day, in best case the weekend, having connected (and letting it be connected) all the time with your charger.
And put off i.e. the WLAN on your iPhone if you leave home, to save a lot of energy AND to protect yourself. Restarting WLAN if needed takes just some clicks and 3 seconds. I think most of people talking about "Massive battery drain" are still in the indexing-procedure or just have everything "on" which is possible. Most of energy is lost by the screen. So shutting down the screen if you don´t use the screen no more is saving energy as well as adjusting brightness at your needs and not always at "max".
Those complaining about battery drain might read all the recommendations about energy saving on the iPhone. Not everyone needs push and pull for emails or notifications for the which you force your iPhone to connect and reconnect all the day to search for actualities... I for myself search with some clicks manually when I have the time to do so. Happily, IOS gives you tons of interesting informations about which apps are draining your battery the most. Even this is worth switching to IOS 12
This is my way to stay free from getting the slave of my smartphone and to block endless disturbing "comfort functions" . STAY FREE as a user.
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Here’s how iPhone SE’s battery has transpired.
Assuming 100% health, assuming real world usage and not just time away from charger.
iOS 9 - Up to 13 hrs
iOS 10 - Up to 10 hrs
iOS 11 - Up to 7 hrs
iOS 12 - Approx 4 hrs
iOS 13 is going to be approx 3 hrs.
In case SE supports iOS 14 it will be approx 2 hrs.
If somebody doesn’t realise this is exactly how planned obscolence is done then they are delusional.
Apple is NOT going to fix this.
They might fix the standby drain issue and that might make the SOT 5ish hrs instead of 4 hrs.
But battery life of SE will not go back to the > 10 hrs it was on iOS 9/10.
Not happening. Period.
This is nothing but totally wrong.
Might be depending on the age of users... Childs and very young users will play endlessly with new functions not yet existing in older versions. So - playing endlessly around with new gimmicks and bigger screens does logically drain more energy than before. This has nothing to do with the IOS version itself, but with the way of using your smartphone - certain generations and characters are always playing around and drain more battery than before and those just using the iPhone as before will even benefit from MORE battery life.
it is that easy.
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This is not good news with my SE on iOS12. Had an unexpected shutdown today with a message saying that the phone was trying to draw more power than what was available. The SE is only 10 months old with a battery capacity of 100% so this shouldn't be happening. As mentioned before in this post I've had no end of problems since the iOS 12 update.
Warranty claim I think.
The latter might be the case. A friend of mine had similar issues (still under IOS 11) and at the end the SE (albeit nearly new) did not charge at all. It seems that some of the SE-production have charging problems. The friend I mentioned above went to an official apple service and they found a definite charging problem and he got a new one - perfect battery time since then and staying perfect even after upgrading to IOS 12.01.... give it a try for testing if you have to face a similar hardware-problem.