iOS 8.1 will bring back the ability to switch between connection 2G, 3G and LTE on the iPhone, so that you can more effectively manage data consumption on your phone. This is necessary for telephone operators only have 2G connection for example, that in some countries it still happens.
Since the launch of the first iPhone to support LTE networks have passed two years and in that time we have often met with criticism that users can no longer disable the 3G connection. Indeed, after the operator begins to support LTE, the ability to disable 3G was permanently replaced with the option to turn off LTE, making the users complained about the weaker battery life caused by just constantly turned on 3G connection. But now Apple comes up with a solution that definitely will please all users iOS 8.1.
Settings iOS 8.1 beta does include a new item in the section Mobile, where the user can himself choose which type of mobile network would like to use. This menu apparently replaces the traditional switch, which is located here now. In order to do so, you will have to go to Settings ->Cellular/Mobile -> Voice & Data, there you will have the three different options to switch to 2G, 3G or LTE.
The feature itself will be part of iOS 8.1, which is likely to come out later this month. Update because, inter alia, contains references to the Touch ID on the iPad and mainly brings support for Apple Pay.