Ok so you have a Nokia Series 40 mobile phone, so how about a free enhanced calculator? Nokia has ported their enhanced calculator app for S60 mobile phones and you can grab it from their betalabs.

This enhanced calculator is a Java app which brings more than the maths function and is available in English, French, Spanish, German, Dutch, Turkish, Italian, and Portuguese.

The latest application only runs properly in mobile handsets that use a QVGA screen 240 x 320 or 320 x 240 pixels; unfortunately on other devices it will show the error message and the calculator app will close.

Source — slashphone