Wait. In that case, I doubt its the splitter.Connect line directly to phone bypassing the splitter with modem switched off. If noise persists, this'll have to be investigated further.
If I am bypassing splitter, why does the modem matter at all? Also. The noise is coming on the phone on the main line outside my house. I mean when that old guy tested with his unit.
Does the line have joints? If so, buy a good quality cable, and have it replaced by an electrician. Easier, if the box serves only your line, that small white box.
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