At times, some apps in the iOS platform are pesky especially when the app suddenly hangs and it wouldn't just simply close despite pressing the home button or even launching the app switcher to manually close it.
I'm talking about iDevices here that runs on the iOS 4.0 & up, which has a default switcher (that can be activated by double clicking the home button.
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| launching the app switcher thru double clicking the home button |
On these occasions, there is a dire need to end the task of that tangled app from the iPhone's memory. To do this, open the app in question then hold down the lock button until you get to see the "slide to power off" prompt. Upon seeing it, hold down the home button until the app finally closes and it should bring you to your homescreen.
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The trick might've been known to you all along but i think it best to still share it.
MAC