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This is a HUGE privacy issue.
In a word, yes; I very much think this matters. Why? Because at the very least it allows any website operator to capture your telephone number and potentially use it to send you spam texts or marketin...
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Yes, not only company that does it bow, here in Czech Republic they will even male money with your number! And you wonder who calls you with cheap suckš' DOŃT $ talk my friend! You #wakeup!
O2 have now fixed the issue :)
Lol how is fixed something half of globe has once?
there's more to the issue. IF they're putting that header on http requests, they're almost certainly proxying connections and very likely with a caching proxy. That can mean delayed changes to pages but it also means they likely have LOGS of all pages browsed sortable by phone number.
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