UTStarcom C1100 User Manual page 59

Calculator Application
5. When starting a new calculation, if the result from the last calculation is
not "0", press to initialize
Press to return to idle state. Contents of the current calculation
are erased, but the memory is preserved
To delete the character you just entered, press . To erase all
entered characters, press and hold
A maximum of 10 digits (with or without minus sign and decimal point)
can be entered at one time. The phone will ignore any additionally
entered digits
If the formula violates mathematical principles (for example, division
by zero and square root of negative number), "Error" will be displayed.
Press to clear this message before entering any operators and
operands
If the calculation result is more than 11 significant digits, "Error" will
be displayed
Precision number after decimal point is 6
51