How to manually force the Mobile App to close on the iPhone?
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If you’re using an older device that doesn’t support multi-tasking, you can quit an application manually – though this also works as a force quit on the newer devices if you prefer. You’ll need to follow the following steps:
Once you’re back on the home screen the application should be closed, and you can re-open it normally again.
Note: Works on iPhone 3G/3GS/iPhone4.