Why can't the landline work

If your landline is unavailable, it may be caused by the following reasons.

Optical cable transmission signal

If your landline transmits signals through optical cables and there is no power supply, your equipment will not work.

The reason for the telephone line

If the computer has broadband internet access, the phone can't get through because of the phone or telephone line.

Power supply problem

It has nothing to do with the computer being unplugged