many earlier review I read prior to purchase this state that they have to call Comcast to activate this modem . maybe Comcast have update they system because as soon as I connect it I be direct to a Comcast activation site where I activate the new device in a couple easy step , within minute my modem be up and run . the set-up be easy and I could not be happier with the result . my internet be faster and considerably more reliable than it use to be . plus , within a year it will start save I money because I no longer have to pay Comcast the $ 7\/month rental on a modem .