I purchased a new Motorola modem MT7711. It says it's certified with Xfinity services. Do I have to notify Comcast of this purchase? I know I have to return my rental, so they will probably ask why, so they will know. If it saves me 14.00 a month, it's better than nothing, especially with the cable prices. Does anyone have this modem? and if so, does it live up to Comcast's rental? I have it up and running, I just hope when Monday comes it's ok with virtual learning. I think it's DOCSIS3.0. Any information anyone has, would greatly appreciate it.