The good news is that Apple will replace your i Phone 6S battery for free.
Some users have tweeted at us saying that their i Phone 4S won't work when they try to update to i OS 10.3.
There's a really good reason for that:i OS 10 compatibility goes back to the i Phone 5, i Phone 5C and the i Pad 4th Gen.
If you have an Apple Watch, you don't need fitness tracking on your phone. When you're at home or work, make sure you're connected to Wi-Fi instead of cellular.
We also found Health, Microsoft Health, Trip Advisor and Waze keeping tabs on us and wasting battery life. When you're out, prevent your i Phone from constantly hunting for open Wi-Fi networks when there are none you can join.
The swipe-up-from-the-bottom Control Center has a handy toggle for W-Fi. Display brightness is the #1 battery life killer, so stop lighting up your phone every two minutes just to check the time.