Simply follow the steps below to hide any folder of your mobile device without any software :
>> Create a folder of any name like ‘myown’
>> Move the files you want to hide to that folder.
>> Now just add the extension .jad i.e. if you have ‘myown’ folder rename it to ‘myown.jad’
>> Now create another folder in same directory with the same name but different extension of.jar (i.e. myown.jar)
>> Its done !
Your main folder (with .jad extention) will be hidden & it won’t be shown.
>> To see the original folder, simply rename the visible folder (of .jar extention) & your hidden folder will be appeared.
*** N.B. : This trick only works in Nokia S40 devices.