A lot of people have been complaining about wasting battery and/or wasting data. The problem is one in the same... iOS uses programming for data signal that hasn't changed since the 3GS. iOS would automatically switch to the highest data service possible. It also prevents you from connecting to your neighbor's network instead of your own. Lastly if wifi is available it automatically connects to wifi. When LTE signal is higher than wifi, your phone will instantly switch and download off cell network. This Unfortunatly affects almost every function that uses data, which adds up. The second issue is caused by wifi having priority over all other data. These two functions conflict each other. So when LTE kicks in, wifi will continously try to reconnect. When LTE has better reception than wifi, it will switch. This causes whatever data usage occurring to stop in order to switch reception type then confirm the connection and verify the phone before it starts up again. Wasting time, data, and battery. Especially since the phone must switch signal chips. Since all signals vary, this can occur 1,000s of times in a minute. As a result people have been reporting massive data use just from push updates.