I thought they only did this if you rent from them. My modem is TP-Link TC-7620. I was analyzing the 2.4 ghz wifi signal due to the Roku express dropping signal intermittently. Using wifi analyzer for android, it looked like an hidden ssid was showing up inside the house. It shared the same channel as my 2.4 ghz wifi network but had a higher dbm. So, I called Comcast and asked them to turn off xfinity hotspot.