The location of the iPhone's sleep timer isn't immediately apparent.

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The iPhone has a sleep timer built into its Clock app. To use the sleep timer, set a time in the Clock app's timer, and set the When Timer Ends option to Stop Playing. When the timer expires, your media will stop playing and the phone will lock.  Visit Insider's Tech Reference library for more stories.

It's not especially easy to find, but the iPhone has a sleep timer built in that does an excellent...

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