Ethernet Wiring

I had 4 wires coming from downstairs, out of which 2 were used for telephone connection and two were free, now I used four of the wires for ethernet, and ethernet is working perfect, now is there a way I can also get phone on that wires...somehow

P.S. : Only provide a cheap solution, and the wires are fixed i cant add more wires...

Nope.

You need minimum 4 wires for Ethernet and minimum 2 wires for phone.

That means total 6 wires are needed if you want to run both ethernet and phone on the same cable.