The four-function calculator now turns into a scientific calculator when you rotate the phone 90 degrees.

现在你只要将手机旋转90度，普通功能的计算器便可以变成一个科学计算器。

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Simple maths is also taught using the calculator function on the mobile phones.

UNESCO: Mobile-Based Post Literacy Programme

The name alone is enough to raise eyebrows, but wait until you see the special features: a biorhythm calculator, a fatness function that calculates a user's height-to-weight ratio, a calendar for keeping track of your menstrual cycle and a calorie-counting function.

ECONOMIST: Mobile telephones

Furthermore, the fx-CP400 features a variety of functions designed to help students learn and instructors teach at school, including a USB mass storage function for quick and easy data transfer, and compatibility with Casio data projectors to enable the calculator's display to be projected on a screen.

ENGADGET: Casio's touchscreen graphing calculator arrives in 2013, makes the TI-84+ look dated