1)Dial to 12140 and select ur language then
2)press 2 then
3)press 10 digit mobile number of which u want to check for balance then
4)Press 1 to conform
5) It will ask mobile pin code press1234
6) Press 3 to find balance in ur mobile.

To create a shortcut on your desktop to lock your computer:
>Right-click the desktop.
>Point to New, and then click Shortcut.
>The Create Shortcut Wizard opens. In the text box, type the following:
rundll32.exe user32.dll,LockWorkStation
>Click Next.
Enter a name for the shortcut. You can call it “Lock Workstation” or choose any name you like.
Click Finish.
You can also change the shortcut’s icon
To change the icon:
>Right click the shortcut and then select Properties.
>Click the Shortcut tab, and then click the Change Icon button.
In the Look for icons in this file text box, type:
Shell32.dll.
Click OK.
Select one of the …

SmartTouch is a free software available for Symbian series 60 phones (5th edition only i.e Nokia 5800). You will require three files to run this software.

SmartTouch client for your phone
Python to run the SmartTouch on your phone.
SmartTouch software for your PC.

Install all this softwares on your phone and PC and see the video below to know that you can do with your smart phone