How to download and install iOS 10.3.1 on your iPhone or iPadHow do I install iOS 10.3? Here's how!
Update April 3, 2017: Apple has just released iOS 10.3.1 for iPhone and iPad, which fixes some bugs and makes security improvements. Here's how to download iOS 10.3.1!
How to install iOS 10 using Software Update on your iPhone or iPad
How to install iOS 10 using iTunes on your Mac or Windows PC
How to make sure you have the release version of iOS 10
What's new in iOS
What's new in iOS 10.3.1
Following hot on the heels of iOS 10.3, iOS 10.3.1 comes with a number of bug fixes and security improvements.
How to install iOS 10.3 using Software Update on your iPhone or iPad
The easiest way for most people to download iOS 10.3.1 is over-the-air, directly on their device. It's fast, it's efficient, and it's simple to do.
Make sure you have a recent iCloud backup.
Launch Settings from your Home screen.
Tap on General.
Tap on Software Update.
Tap on Download and Install.
Enter your Passcode, if prompted.
Tap Agree to the Terms and Conditions.
T...
Source:
How to download and install iOS 10.3.1 on your iPhone or iPad