You must be thinking why would anyone want to do that. Wifi causes a bunch of health hazards, just google a bit and you will get handful of nightmarish results. In my case, we use to switch off the modem when not in use. But then some wifi connectivity issue popped up. So last few weeks we are using ethernet cables for both desktop and laptop. So there is absolutely no need to enjoy wifi radiation.
All i did is
1. just go to my Binatone 845w modem’s settings page at 192.168.1.1
2. give the user name and password ( The default is admin/password)
3. Go to interface setup>wireless> deactivate wireless.
Thats it. Hope you find it useful too.