Don’t have unlimited data? then you may want to read this

Apple did a good job introducing some nice little hidden features to make our use even smoother and one of those little features was Wi-fi Assist.

Wi-fi Assist basically switches you to 3G if your wifi connection is poor so your browsing experience isnt interrupted, however this isn’t great if you are not on an unlimited data plan.

Wi-fi Assist is automatically swithced on in iOS 9 & iOS 9.0.1, if you want to switch this feature off head over to settings Mobile data (Cellular in the US) and scroll right to the bottom and toggle Wi-fi Assist off.

With this feature switched off you may also noticed slight improvement in your battery life.