Apple are working on fixing the problem with a 9.3.1 release, but if you’re still on iOS 9.2 and your iDevice asks if you’d like to update to 9.3, follow the advice from Game of Thrones’ Syrio Forel and say “Not today!”
How to check which version of iOS your iDevice is running
Here’s how you can tell which version of iOS your iPhone, iPad, or iPod Touch is running. From your Home screen, tap on the Settings icon (pictured above), which will take you to the Settings screen. Yours should look similar to mine:
About halfway down the screen, you should find an item marked General (highlighted in the screen shot above). Tap on it, and you’ll be taken to the General screen:
The version number appears in the Version item (highlighted in the screen shot above), which should appear near the bottom of the screen. That’s an actual screen shot from my iPhone, and you can see that I’m running iOS 9.2.1.
Click on the Settings icon, which will take you to the Settings screen. Scroll down until you see the Safari item, then tap on it:
You’ll be taken to the Safari settings screen. Scroll down all the way to the bottom and tap on the Advanced item: