This guide is for all iphone users having less momry issues on their iDevices after using this guide i am using backgrounding very well!.
This guide requires Jail Break iDevice.
open up cydia ,
and add this repository => http://repo.beyouriphone.com/
search iPhoneVM from cydia and install it ,
after installing reboot your iDevice and you will feel difference i tested this on my iphone 3g my free RAM was arround 36 mb but its now 69 mb really great fix.
