After I had the Hopper installed, I switched to cable for my ISP and phone line. The caller ID on the Hopper worked for a day, then stopped. Then it worked for another few hours one day a few months later, then stopped. I get a dial tone at the jack connected to the Hopper, so I think the cabling is solid. The phone line seems to work for my alarm too. I figured it just hopeless and I'll need to live with it, but though I'd check in case there is something I can adjust. I get a lot of sales calls, so I'd like to screen them like I did back in the 622 days.