This is a HUGE privacy issue.
Open Digital Policy Blog: O2 sends you phone number to every website you visit, should you be bothered?
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...
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!
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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