I 'll make this quick and hope I be not jinx myself . this be the easiest thing I have do in deal with Comcast . I lease this ubee modem already through Comcast and want to just buy one instead . I originally buy the Motorola sb6121 . I be sure the modem be fine , but I have issue in get it work with the Comcast representative , ` course that be probably the main problem right there . anyway , I return it and buy this ubee -lrb- which be the exact model I have be lease -rrb- . I unplug they modem , plug mine in , go to comcast\/activate self install webpage and 10 minute or so later I be up a run with no issue -lrb- knock on wood -rrb- . I give Comcast they modem back today and hope I do not have to fuss at they billing department next .