I be expect to be able to enter my Comcast account number and phone number to activate this new modem on line . sadly , in my area , -lrb- MA -rrb- , this do not work . I end up call Comcast and they want they old lease modem return before they would activate the new one . after return the old modem to the Comcast service center , they enter the new MAC address into they system and tell I the new modem be activate . when I return home and start my pc , my home page be the Comcast activation page where I then need to enter my account number and phone number to complete the activation process . as I enter this datum and hit the `` next '' screen button , the process freeze and I end up on a Comcast chat line . the on line tech be able to finish up the activation and I be now back on line . the new Motorola appear to work fine and I will save the leasing fee of $ 7 each month . just be ready to return the old lease unit first and spend some more phone and on-line chat time with the friendly Comcast tech before this unit be up & run .