iOS 4 introduced the multitasking feature which means that every application you open, stays open in the background…using RAM and slowing down your device.

What you should do from time to time is to power off your device or, if you have a jailbroken device, install the free SBSettings which is available via Cydia ModMyi.com repository.

The application will help you free up available memory on the go as well as give you a faster way to enable/disable Wi-Fi, Bluetooth, 3G etc.

Once you install via Cydia, there won’t be an application icon on the screen. To launch it though just sweep with two finger your iPhone‘s status bar or tap the bar with two fingers. Now you’ll see a whole bunch of toggle switches. Green is enabled, red is disabled.

SBSettings can be launched virtually from anywhere you are on your device, as long as the status bar is accessible.

SBSettings is a great and very powerful applications. A must have on any JB device.

If you would like to jailbreak your device, follow this guide