Turn off interfaces draining your battery life; it detects when your phone is idle and then it can power off:
Bluetooth, WiFi, APN for background data exchange and sync mode, Airplane mode.
Usefull to save battery in the night.
Reduces 2G/3G mobile traffic.
Periodic updates allows turning on interfaces after a delay, to allow background data syncing.
Delayed power on for briefly looking at phone.
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