Anybody can do that It's so simple .
Here is the step by step instructions to do that :
First of all insert sim in usb Modem .
When you insert the sim of any other operator ;s sim in modem .this will show invalid sim , ignore it and close the modem software .
Just start the nokia pc suite .
Goto nokia pc suite connect to internet option .
Goto Configuration and Select your data card modem ,and make all operator apn setting as like when we use nokia mobile
Finish the set up .
Connect to internet through PC suite .
Now your internet is connected without unlocking the modem .
That's it .you have done it.