O2 data breach potentially shares your cellphone number with the world (Updated)
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There's an alarming rumor circulating that suggests that UK network O2 forwards your phone number to any website visited on a smartphone. Lewis Peckover built a site that displays the header data sent to sites you visit, finding a network-specific field called "x-up-calling-line-id" which displayed his number. »read more
More at: Engadget Add additional source
Filed in: O2
Additional sources: O2 apparently sends your phone number to every website you visit read at IntoMobile Report