I am customer of Vodafone Germany as my mobile network provider. After extension of my RED S mobile contract i realized, that the option "Vodafone Secure Net" is enforced by the company without informing me beforehand. After calling the customer service i found out, that its free for 3 month and that they are not able to deactivate before. For me this situation is not acceptable, because i don't want my network provider to monitor or even MITM attack my connections as stated here (german source). Even encrypted traffic is monitored:
The upgrade is also designed to help detect likely sources of malware that is hidden within encrypted web traffic using a secure HTTPS address. Further, parents can monitor the online activity of their offspring through the Secure Net app. (source)
So my question, how does Vodafone Secure Net or similar services affect the users privacy and / or security?