Select Menu > Settings and Connectivity > USB.
To have the device ask the purpose of the connection each time a compatible data cable is connected, select Ask on connection > Yes.
If the Ask on connection option is deactivated or you want to change the mode during an active connection, select USB connection mode and from the following:
Ovi Suite - Use Nokia PC applications such as Nokia Ovi Suite, and Nokia Software Updater.
Mass storage - Transfer data between your device and a compatible PC.
Image transfer - Print images with a compatible printer.
Media transfer - Synchronise music with Nokia Ovi Player or Windows Media Player.