# Tweet by [@keefmoon](http://twitter.com/keefmoon) on 2012-01-25 23:07:10 > [!INFO] Archived from [original tweet](http://twitter.com/keefmoon/status/162310571230896128) RT @mattgemmell: Ugh. @o2 (UK mobile carrier) adds your phone number as an HTTP header if you're on 3G, revealing it to sites. http://t. ...