"Q: Which websites do you normally share my mobile number with?
A: Only where absolutely required by trusted partners who work with us on age verification, premium content billing, such as for downloads, and O2's own services, have access to these mobile numbers."
But those trusted partners may share your mobile phone number with their "trusted" partners. I know Ericsson IPX does this at least in Germany.
It usually works via several http redirects and is unnoticeable even to the client application using the usual http client APIs.
A: Only where absolutely required by trusted partners who work with us on age verification, premium content billing, such as for downloads, and O2's own services, have access to these mobile numbers."
But those trusted partners may share your mobile phone number with their "trusted" partners. I know Ericsson IPX does this at least in Germany.
It usually works via several http redirects and is unnoticeable even to the client application using the usual http client APIs.
You can prevent this by using a http proxy.