How to closed open app in 3G (don't have multitasking display like in 3GS and 4G)?

Since 3G has slower CPU and smaller RAM compare to 3GS and 4G, then I think it should be useful if we could completely shut down app when we stop using it.

When the RAM gets used up, the iPhone will shut down apps all by itself, you needn't do anything.  Of course, that doesn't always mean it works perfectly.  The only way to close apps is to turn the phone off and back on again, which may be overkill most of the time, but I found necessary when I had a satnav app running, slowing everything else to a crawl.

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