Click on the computer activity icon which is similiar to my-computer icon and will be blinking off and on. and will be placed on your task-bar.
OTA status of the Nokia modem will be opened. Click on the Properties. Select Configure option from the Properties window. This will open up the Modem Configuration window. Select the Maximum speed available in the Maximum speed option. And press OK to save the settings. Now Disconnect the Internet connection and Reconnect it to avail more speed.