Moved from this thread: as per Elimentals recommendation

I have found that my phone shares details about me to every site I visit.

I am with Vodacom and have a Samsung Galaxy sII. Strangely it only does it if I browse from native browser.

Either way I set up my own little test which includes MXIT user id which seems to also be the users phone number (not tested please let me know if you have MXIT):

I also wrote a blog post about it here:

I also found a document of previous user information collected by a South African website which contains a lot of user data include a ton of phone numbers:

Looking at this you can see that it is pretty much only be Vodacom contract phones. Except for the MXIT data that does not seem to be network specific.

Does anyone know if this is legal? I shouldn't think it is to be honest.