Nokia 2135 - Manual (Page 46)

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Press * to cycle through the add (+), subtract (-),
multiply (*), and divide (/) characters. Pause briefly to
select the displayed character.
3. Enter the second number in your calculation, press
Options > Equals to get the result.
To perform a square or square root calculation, select
Options > Square or Square root . Select Options >
Change sign , or scroll up or down to change the sign
(positive or negative) of your result.
Countdown timer
You can enter a specified time up to 99 hours, 59 minutes.
The timer starts to count down. When the timer reaches
zero, an alarm sounds.
The countdown timer only works when the phone is on.
When you turn off your phone, the timer is no longer
active.
To set the countdown timer, select Menu > Organizer >
Countdown timer . Enter the time, and select OK . Enter a
note for the timer, and select OK (in hh:mm).