If I unplug the 2 line phone, the hum goes away. The problem only exists when the 2 line phone is connected using mj and pots. If I disconnect mj, the rest of the phones are fine. I would have suspected the phone except for the fact that the phone work fine for a year and as soon as I switched to verizon the problem began.

I guess I could try a different phone but I really like this one and it wasn't cheap.

justbill, what is a SLT?