A flaw in O2 UK's implementation of VoLTE and WiFi Calling technologies could allow anyone to expose the general location of a person and other identifiers by calling the target. [...]
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source https://www.bleepingcomputer.com/news/security/o2-uk-patches-bug-leaking-mobile-user-location-from-call-metadata/
source https://www.bleepingcomputer.com/news/security/o2-uk-patches-bug-leaking-mobile-user-location-from-call-metadata/