19Line switch: when switching to the line 2, phone canonly receive calls and can not dialClose group2.2.2 Advance settingsAutomaticredialYou can open or close (only for current number)Auto quick end Set the duration of the call. The call will be hungup when time is up.IP Dial up First set IP code and then dial up with IP codeBackgroundmusicWhen open, you can choose whether addbackground music during a callCall timedisplayDisplay the duration of call timeCall timereminderRemind the duration of call time3、CalculatorQuba q121 provides you with a calculator with four basicfunctions to help you with simple operations.Go to calculator menu and press OK to enter.¾ Input numbers with 0-9 keys on the screen; click thedel key to delete the last number inputted.¾ Press the upper/lower/left/right navigation key tochoose arithmetic expression, or press thecorresponding key in keypad to do it. Then click OKkey or enter key to get the result.Note: This calculator accuracy is limited, will have arounding error, especially in case of indivisible.4、Slide showChoose a folder with pictures in storage card, set mode, speed,special effect and other options, and then you can play theslideshow.5、Alarm1) Enter Alarm, select on to turn on the alarm; and select off to