These days, cellphone software, called X Spy, is popular. Once installed the owner can send it to other phones through messages. Then any information in the receivers' phones can be monitored.
Although priced as much as 1000 yuan, roughly 150 US dollars, many people still purchase the software. They want to know what is happening with their friends and use the software to monitor them.

Experts call this kind of software a virus. Currently, they're rampant on the Internet. Some come at a price, while others are available for a free download.

Easy access makes them more readily available to circulate through cellphones. They are often used in a malicious way.

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