Bugs? Fixed 'em. Security? Improved it.
Andrew Cunningham - 4/3/2017
iOS 10.3.1 is out. The release notes don't specify what it fixes that wasn't addressed in the wide-ranging iOS 10.3 update released just a week ago, but we do know that this new update includes bug fixes and improves the security of your iPhone or iPad. Specifically, according to the more detailed notes on Apple's security page, 10.3.1 addresses a buffer overflow that could be exploited to execute code on your phone or tablet's Wi-Fi chip.
Full Article