If your iPhone accidentally stop working or hang for a long time during ruuning of iPhone’s applications or widgets as well as do not respond after pressing the Home button. Not able to see anyting on screen, like your internet or system activity including videos, pictures or Web page loading, suddenly stop as well. When such kind of thing happens, the condition indicates that your iPhone software has been “frozen.”
One more indication behind iPhone freeze can be a black screen after turning on your application. It may be due to battery damage too so can not be main cause of iPhone freeze.
For quickly unfreezing your iPhone you can try this simple step if no any major damage is occurred this excercise will help you a lot and easily unfreeze your iPhone.
Step to follow: Press Home button and hold down for about few seconds. you will immediately return to the Home screen, without losing anything in earlier condition again.
If this does not work you can try following techniques to unfreeze your iPhone.
While working on iPhone application or widget you may be thrown
While working on iPhone application or widget you may be thrown to your Home screen unexpectedly without doing so. And due to this you may lose your recent changes like any closed program has been opened or opened application can be closed. It occurs due to your iPhone software has been crashed.
If the same thing is repeating again and again close all applications and restart your iPhone. This action will recover your iPhone application. After restarting most of the problem may be solved if it occurs due to only mismatching of event sessions.
To restart an iPhone, press and hold the Sleep/Wake button until a red slider appears on the screen. Now all you have to drag the slider to power off your iPhone. After that you have to press and hold the Sleep/Wake button again until the Apple logo appears on the screen. Wait a few seconds for iPhone’s startup process to finish, and you should be back at the Home screen.
If your iPhone is really confused, even holding down the Sleep/Wake button may have no effect. In such cases, you can generally force the iPhone to restart by holding down the Sleep/Wake and Home buttons simultaneously for around 10 seconds.
Although I have seen no official confirmation of this from Apple, I expect that the difference between a normal and a forced restart is that the former restart is more “graceful,” making sure that all files that should be closed before restarting have done so.