Since smartphones now are essentially mini computers, they also screw up in similar ways to a computer. For many weird issues, sometimes the best fix is to just turn it off and on again, or pull the battery. On iPhones that can’t have their battery removed, hold down the power button and home button until the apple logo appears on the screen. On Android phones, hold down the volume up button, power button, and home button for about fifteen seconds. These both simulate a battery pull.