One of the major bugs that most the iPhone users complained is the battery drain dramatically after they update their firmware. Some also found that the usage time is actually same with the standby time as indicated in the setting. This means the iPhone is continuously running even they put it in standby mode. Here is the solution to fix the battery drainage problem:
1st. Turn off WiFi.
2nd. Turn on everything on cellular data (3G, Cellular Data, Data Roaming)
3rd. Wait until iPhone gets 3G signal, after it wait ~5mins
4th. Turn off 3G (DO NOT connect to any Wi-Fi networks before this is done), DO NOT turn off cellular data and data roaming.
5th. Turn on Wi-Fi. Connect to home Wi-Fi if available.
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