Not all changes that new software versions bring are always welcome with open arms. It isn't uncommon for one or two or even more new features, or the removal of such, while strike a nerve. In the case of Apple's iOS 9, that is probably the contentious Wi-Fi Assist. Supposedly designed to make surfing the Web a more fluid and painless experience, it has actually caused more pain for users unaware of the feature and the data charges that it brings. Apple isn't disable the feature in iOS 9.3 beta 1, but it will let you keep an eye on it at least.