I know this is an old thread, but I had this happen today---a phone showing up in my network. My network is passworded, but it still worried me, so I turned off my wireless and just plugged in the ethernet for all my computers which connect to my router.
My wife, who usually isn't at all tech-savvy, blew my mind when she suggested "Honey, maybe it's your TextNow app". You know, the app from the Windows Store? I have it and use it often. I thought her suggestion was pretty darned cool, especially for someone
who is usually not into tech at all.
I still don't know whether-or-not the TextNow app is responsible for the rogue phone showing up with only a MAC address in my wireless, but it doesn't show up in the network when I'm ethernet-only, so I'm actually doubtful that it's the TextNow app. But
not 100%. I mean, with TextNow you are assigned a phone number....so it could be the culprit. I'm curious if the OP had that app installed when he noticed the phone in his network....
Anyone have any thoughts?
^ Nonsense.
This phenomenon is explained already on the previous pages.
Modern apps have no low level control over the computer, they are very limited. They can't touch the network devices list.
Whether you are connected via a wire or without one, as long as your router itself has a Wireless component (most of them do nowadays) you will see the phones in your network.