[Stephen]

I think you are misunderstanding the question and situation.

The OP is not talking about making wifi calls from the PC. But using the mobile phone to make/receive calls over WiFi as his mobile signal isn't great at home.

However the PC is connected by ethernet to router as the OP doesn't want the PC to use the WiFi connection, preferring wired. Was asking if he enables the routers WiFi again, if they can turn of the PCs WiFi, thereby ensuring it will still be utilising the wired connection.