Xfinity Now internet modem setup
It turns out you need to call the prepaid department to set up the modem. You can't do it by yourself through the Xfinity app. I was a regular Xfinity internet customer, and I wasn't able to switch to the Xfinity Now internet in my account. I called Xfinity to make the switch, and they cancelled my regular internet plan and signed me up for the Xfinity Now plan, which is a prepaid plan. As long as they cancel your regular internet, I think you can choose to subscribe the Xfinity Now plan on your own on their website. With the Xfinity Now modem (made by ARRIS Group, Inc.), you can actually customize the WIFI network credentials. Access the modem control webpage by accessing 10.0.0.1, the username is "admin", and the initial password is "password". Then you will be asked to change the password. After logging in again, you can change the WIFI network credentials at Gateway -> Connection -> Wi-Fi. So far I am happy with my 100Mbps plan. It is cheap and str...