Additional Ideas for Turning Your iPhone On and Off
The four states of an iPhone are on, off, sleep, and airplane mode. When an iPhone is off, it can only be switched on. When an iPhone is on, it can be switched to off, sleep, or airplane mode.
In sleep mode, the iPhone can only be switched to on. In airplane mode, you can switch an iPhone to sleep or off.
As a general rule, turn off your iPhone whenever you don't want to be bothered with incoming calls or text messages, such as at night when you're sleeping or if you're busy on a hot date.
Airplane mode is most useful when you're stuck in an airplane and don't feel like interacting with any of your fellow passengers, preferring to let your iPhone amuse you instead.
Sleep mode is generally used during ...
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