GraphViewer Scientific Calculator 3D - GraphViewer is a graphical calculator that you can download and install on your mobile phone. With GraphViewer you can plot equations using the build-in functions, calculate its derivate, show a table with the functions critical points .......
NOT A GAME

Javia Calculator Javia Calculator - easy-to-use calculator for mobile phones. It features a user interface designed for the mobile phone's keypad, which allows quick input of mathematical expressions.
Built-in functions include trigonometric and hyperbolic functions, logarithms and exponentiation, permutations, combinations and factorial

PCalc for Java PCalc for Java - Programming calculator. You can write programs for stack machine (with simplified Java like instruction set). Program consists of one or more procedure which can be nested. It is possible to access variables of top procedure (like in Pascal). You can execute program ste-by-step and inspect stack and variables in debugger

Calculator V1.02 Calculator V1.02 - This is the calculator which has many functionalities than the normal calculator provided in the mobiles, this software is mainly designed for the touch screen mobiles. This will not work on the mobiles which do not have touch screen facility

MIDP Calculator MIDP Calculator is a Java calculator for mobile devices. It works much like a good old HP calculator with RPN logic, but the stack has 16 elements and you can see many of the elements on the stack simultaneously

MIDP Graphing Calculator MIDP Graphing Calculator - A graphing calculator for Java MIDP cell phones.
It actually implements a small programming language, parsing expressions into trees. One can define functions with an arbitrary number of parameters, and use the functions in java.lang.Math in addition to the normal operators