I almost never turn my iPhone off. But, if I am out and about and far away from a power outlet or my charging cable there are sometimes that I have to turn it off to save my battery. If you find yourself in a similar situation hold the lock (or sleep) button on the top of the phone down until you see the “slide to power off” slider – about 3 seconds. You can also try this if your phone is acting strange. On the rare occasions something is not quite right, switching my phone off and then turning it back on (by holding down the same button until the Apple icon appears) will have everything back to normal.