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Never minding the fact that you say you share this only with "Trusted Partners", it has no bearing on the seriousness of this. If people's mobile numbers are being sent in plaintext over the open internet, even if it's only to certain sites, that can still relatively trivially be obtained via a man-in-the-middle attack, unless HTTPS is used, which I assume in many cases it is not. What is your response to that? In addition, I can easily spoof any HTTP header I want with a few easy commands. If this is used for billing and tracking, what's to stop me from adding an arbitrary UK mobile number to a HTTP header, visit one of these "trusted sites", and access content on someone else's bill? Even still, what are the implications for that person's privacy if their identity can be spoofed accessing all kinds of content that they may not be happy about?
Toggle Commented Jan 25, 2012 on O2 mobile numbers and web browsing at O2 Blog
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Jan 25, 2012