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They should check permission requests by an app at its installation, the application’s description page on Google Play, the privacy policy, and terms and conditions.

Moreover, if a user creates a profile for the service, information such as nickname, gender, city of residence, birthday, and self-introduction provided on the application screen are sent with the other numbers.

A user is not required to input real information, if a user adds more detailed personal or attribute data–such as hobby and preferences while chatting–this information might be stored on the developer’s site, associated with the phone number. Figure 2: The application screens of the two suspicious chat apps.

Figure 1: Two Japanese chat apps steal a device’s phone number.

The apps, Chatline and Connect Line, give users the impression that the apps are related to Line, a popular messaging app in Japan, though they actually have no relationship at all.

The apps retrieve a device’s phone number, International Mobile Equipment Identity (IMEI), and Subscriber Identity Module (SIM) serial numbers, and send them to a remote web server.

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