Ashish_Ghorela Hide folder in Nokia mobile
Add new folder 'RDS.jad' in your memory card.
Put all the data which you want to hide in the folder RDS.jad
Now create a other folder 'RDS.jar' in your memory card.
You will find that the folder RDS.jad will be hide.

[Note: This trick is avilable in only nokia mobile phones]

For lock files in all java mobile phones, download RDS 2.7 by click here: http://kundanpura.yn.lt/files/RDS_2_7.jar