6. Secret iPhone codes
You can hide your number for an outgoing call with a simple code. If you enter *#31# you will hide the number for all calls. If you need it just for one certain call, you can type #31# right before the number you’re calling.
5. Audio timer
This iOS feature is great for those who like audiobooks and listening to music before falling asleep. You can set the timer to turn off the audio. Go to Timer, and choose its length. Tap When Timer Ends,and select Stop Playing at the bottom. Select Set, and start your timer. When your timer goes off, any audio currently playing will stop.