How to hide folders in mobile phone

Steps to hide  folder in mobile phones.(I Explain this by taking Nokia phone as example)
1: Select the folder you want to hide.
2: Select Options
3: Select Rename folder
4: Give the name as Name.jad (Here Name can be any word)
5: Again go to Options and select Add folder
6:Give the name Name.jar (Where Name should be same as that you given above)
7:The you can see the only the folder Name.jar Which will be a empty one.
8:To see the hidden  folder just delete the .jar folder

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