18■ Connect a compatible headsetDo not connect products that create an outputsignal as this may cause damage to the device. Donot connect any voltage source to the Nokia AVConnector.When connecting any external device or anyheadset, other than those approved by Nokia for usewith this device, to the Nokia AV Connector, payspecial attention to volume levels.■ Connect a USB data cableTo set the default USB connection mode,select Menu > Settings > Connectivity >USB > USB mode and the desired mode. Toset whether the default mode is activatedautomatically, select Ask on connection >No.■ Attach a wrist strapConnect the wrist strap according to thegraphic.For instructions on removing the back cover, see step1 in “Insert a SIM or USIM card and battery,” p. 9.3. Call functions■ Make a voice call1. In the standby mode, enter the phone number, including the area code. Pressthe clear key to remove a number.For international calls, press * twice for the international prefix (the +character replaces the international access code).2. To call the number, press the call key.