Nokia 3100 and Nokia 3120 User Guide 49 Copyright © 2004 NokiaExtras20 ExtrasExtras include a calculator with currency exchange rateconverter, countdown timer, stopwatch, and a voice recorder.• CALCULATORBasic calculationsThe calculator in your phone adds, subtracts, multiplies, divides, calculates thesquare and the square root, and converts currency values. Calculator has a limitedaccuracy and rounding errors may occur, especially in long division.1 Select Menu > Extras > Calculator and enter the first number in the calculation.Note: Press the Pound key to insert a decimal point and press the Star keyto cycle through the add (+), subtract (-), multiply ( * ), and divide (/)characters. Pause briefly to select the displayed character. To perform asquare or square root calculation, select Options, then select either Squareor Square root.2 Enter the second number in your calculation, then select Options > Equals.Currency conversionYou can convert foreign currency to domestic or vice versa from the start screen.1 At the start screen, enter a currency amount to convert, then select Options,and select either To home or To foreign.2 Enter the exchange rate, if you have not done so already, and select OK.Edit the exchange rate1 Select Menu > Extras > Calculator > Options > Exchange rate, then selecteither Foreign units in home units or Home units in foreign units.2 Enter the exchange rate and select OK.• COUNTDOWN TIMERYou can set the alarm to ring after a period of lapsed time.Note: The countdown timer only works when the phone is on. Once youturn off your phone, the timer is no longer active.Set the timerSelect Menu > Extras > Countdown timer, enter the time in hh:mm format, selectOK, enter a note and select OK.