Boffins from Michigan State University in the US and National Chiao Tung University in Taiwan have found that the Wi-Fi calling services offered by AT&T, T-Mobile US, and Verizon suffer from four security flaws that can be exploited to attack mobile phone users, leaking private information, harassing them, or interfering with service. In a research paper distributed through preprint service ArXiv on Thursday, eight computer scientists – Tian Xie, Guan-Hua Tu, Bangjie Yin, Chi-Yu Li, Chunyi Peng, Mi Zhang, Hui Liu, and Xiaomin Liu – dismiss existing Wi-Fi calling security mechanisms.

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