Little FYI: Wi-Fi calling services on AT&T, T-Mobile US, Verizon are insecure, say boffins

Subscribers using wireless calls wide open to attack

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."