Subsequently, the fraudulent certificates were used to perform MITM attacks. In 2013, the Nokia's Xpress Browser was revealed to be decrypting HTTPS traffic on Nokia's proxy servers, giving the company clear text access to its customers' encrypted browser traffic. Nokia responded by saying that the content was not stored permanently, and that

The simplest way to register mitmproxy certificate on a device is to visit URL after connecting the device through mitmproxy. The web page that will open, offers mitmproxy certificate to be installed. Accept that certificate. Now you are ready to intercept HTTP and HTTPS communication. Intercept communication