zToggle is a new app available from Cydia which disables and enables multitasking on your iPhone 3G from within your iPhone. It is to remind you that iOS 4.0 enables multitasking on iPhone 3GS and iPhone 4 only and it doesn’t provide support for multitasking on iPhone 3G when updated to the iOS 4.x firmware.
Because you can download this app from Cydia only, so you will have to jailbreak your iPhone 3G first. If you jailbreak your iPhone 3G with Redsn0w, you can also enable multitasking and homescreen wallpapers but you can’t disable multitasking after jailbreak unless you re-jailbreak your device by following the same steps but un-checking the multitasking feature.
zToggle is also helpful in situations when you need speed and performance over multitasking function. Multitasking is not enabled on iPhone 3G updated to iOS4 by default due to limited hardware resources and if we enable multitasking by jailbreaking, it slows down your iPhone 3G.
Toggles for Multitasking and Background Wallpapers. No need to use redsn0w or Pwnage tools to toggle Multitasking and Background Wallpapers. This app will let you do that in seconds right from your iDevice. Note that this app is only for iPhone 3G. Users for other devices like iPod Touch can try but at your own risk.
Free Download zToggle:
zToggle can be downloaded from the BigBoss Cydia repository free of cost.