As Western social-media companies consider how much they are willing to censor to gain access to China’s hundreds of millions of walled-off internet users, a new report looks at steps China’s dominant mobile messaging app has taken going the other direction.

WeChat, the immensely popular mobile app run by China’s Tencent Holdings Ltd., censors its users differently depending on whether they register using a Chinese or a foreign phone number, according to the report.

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