18■ Connect a compatible headsetDo not connect products that create anoutput signal as this may cause damage tothe phone. Do not connect any voltage sourceto the universal headset connector.When connecting any external phone or anyheadset, other than those approved by Nokiafor use with this phone, to the universalheadset connector, pay special attention tovolume levels.■ Connect a USB data cableTo set the default USB connection mode,select > Settings > Data Cbl. > Data CableMode. To set the default mode to be activatedautomatically, select Ask on connection > No.The USB data cable is for data transfer onlyand does not support charging.3. Call functionsTo adjust the volume during a call, press the volume key.■ Make a voice call1. In the standby mode, enter the phone number, includingthe area code. Press the backspace key to remove a number.For international calls, press + for the international prefix(the + character replaces the international access code),and enter the country code, area code (omit the leadingzero if necessary), and phone number.2. Close the cover.3. Press the call key.4. To end the call, or to cancel the call attempt, press theend key.To make a call from Address Book, select > Addr. Book. Scrollto the desired name, or enter the first letters of the name to seepossible matches. To call the number, press the call key.