O2 mobile users in the UK are fuming at their discovery that their phone number is being shared with every website that they visit over the network. The problem is still present almost two years after it was first discovered. O2 says that the problem is now fixed and has published an explanation of what went wrong. If you want to know if your smartphone is revealing your phone number when you browse websites, visit a demo page by Collin Mulliner: www.mulliner.org/pc.”]
Source: https://nakedsecurity.sophos.com/2012/01/25/smartphone-website-telephone-number/