Sorry, I don't do direct communication.
"I can use this cant i and get rid of land line as thats what i thought wi fi was "
Maybe that's what you thought Wifi was, but you were wrong. Wifi communicates over very short distances. You can use it in a Wifi hotspot (such as a hotel, airport, etc) or at home. But wherever you use it, it communicates over a short distance with a device called a router, which is connected to a land-line (or cable). So, you still need a land-line if you want to use it at home!