I have a Raspberry Pi attached to my home network with one of these tiny WiFi adapters (http://www.expansys.com/edimax-wi-fi-150mbps-mini-usb-202741...). It's in a small white box (http://www.amazon.co.uk/Raspberry-Pi-case-professional-injec...) and attached to the wall. It's completely unobtrusive, looks like it might be something to do with the phones.