I buy this modem to use with comcast . you can not activate the MODEM THROUGH the ACTIVATION SCREEN that pop up , you must call COMCAST YOURSELF . save time and just call they , take about five minute to get it activate . no problem so far , the modem do not get hot just a little warm , and there be a speed small increase in internet speed . this be a good modem ; it 'll pay for itself in 12 month . would recommend .