At some point you may find that your iPhone, iPad, or iPod touch starts acting a little whacked — the screen may freeze or the touchscreen may stop responding. In most cases, a simple reset will fix the problem.
First, note that there is a difference between a “reset” as we are discussing here and a “hard reset.” A hard reset restores your device to factory settings — it erases everything on your iOS device. Do not perform a hard reset unless you are absolutely sure you know what you are doing and why! (We’re not even going to discuss how to do it in this Tip.)
Fortunately, a basic reset will fix most problems, and it does not affect any user settings or data. It simply “cleanses” the iOS device and gives it a bracing cold water wake-up splash. To perform a reset, hold the device’s Home and Power buttons down at the same time until the Apple logo appears on the screen. At that point, release the buttons and let the device finish rebooting.