Let me add my 2 cents.
Got new Hopper 3 on 12/4/16.
Had old Hopper with Sling connected through a surge and power supply so ran satellite feed and phone feed through that and had Caller ID that worked fine displaying incoming calls. Technician took that out and said not to hook up new Hopper 3 that way because it caused some type of interference. So hooked up satellite feed direct and removed phone line completely. Yesterday, I missed having incoming calls display on the TV, so I attached a phone line to the phone input on the Hopper 3.
Today, internet speeds were download of 0.28 mbps. Had to wait several minutes on every new site. Terrible or worse. Eventually wondering if I had a rusted connection in the phone box by the street that had happened a couple times before. Started thinking about my wiring and suddenly thought about the most recent change -- connecting the CALLER ID function by attaching a phone line to the Hopper 3. Disconnected the phone line and speeds immediately back to normal.
So my caller id does not display, but in addition it upset my entire WiFi network on all devices so the speeds were incredibly slow. I imagine the modem kept attempting to get a good signal and it took a long, long time so speeds were very slow. So there is something wrong on this phone line connection in the Hopper 3--not only that it does not work, but that it is producing interference in the entire system.
Hope this helps resolve the problem.