I be able to call Comcast and get it register in they system for the internet to work . I have yet to try the internet though because it be be set up at my new home and no computer be on hand . the process be very easy -lrb- I have read some of the review on here ahead of time which help -rrb- . Comcast compatible so I be very happy about that . go to save $ 7 a month now . only thing left now be time -lrb- reason for 4 star rating and not 5 -rrb- . if I have trouble connect to the internet or connection problem I will update this review . if you have Comcast -lrb- in the Chicago land area -rrb- , this will -lrb- or should -rrb- work for you . UPDATE : Internet and cable work well and be reliable with this modem . even if I have to change to a different room it connect back up with a minute and be good to go . I have the hd cable box from comcast and it work with this modem and internet connect quickly as well . if you can dish out the $ 80 and plan on stay with comcast , I would recommend get this modem -lrb- if you do not need telephone - this do not work for phone ... only cable and internet -rrb- . Hope this help .