An enterprising fella’ has uncovered a sneaky scheme by UK mobile phone and broadband provider O2, that gives out a users mobile number whenever they visit a website on their phone.
Those wishing to prove his claims can visit his test site here. If you go there using an O2 connected phone, without using WiFi, you should see your mobile number appear along with the other information gathered about the device being used.
The man that discovered this is Lewis Peckover, and he’s been discussing the problem on Twitter. The first one that begun talks of O2’s sneaky behaviour was: “So, @O2 send my phone no in an HTTP header to every site I browse. WTF? [...]