I unfortunately have an XFinity bundle (tv,internet,phone) all going through the same modem/router. Within days of getting it, I received a telemarketer phone call before I even gave out my number. I ticked him off somehow and he began mumbling/whispering (as though he was around a lot of people and didn't want them to hear) curse words, calling me a b**** and asking if I was rich?!? Within a week I was called by my credit card company because someone made a purchase several states away from me (under $50-BTW who makes such a small charge when you have someone's credit card?). I disconnected the phone because I thought maybe he could have gotten access to my network since the phone goes through the same modem/router as internet and TV. I still don't know if that's possible but since then I have always wondered if the guy still has access to my laptops/tablets/cell phones when they're using WiFi (and to be more paranoid - even when they're not online). Well it's been months and I thought that was over with until today I found a HIDDEN cell phone in Network>Devices. When I first opened "devices" the phone was there for a couple seconds and then gone. Then I enabled to see "hidden devices" and there it was again. It was called w3c_trf_us and model LGL34C (LG Optimus Fuel) and only other info in "details" and "troubleshooting info" is the MAC address. I understand from other posts that my network could be "seeing" devices close by, but this was HIDDEN and when I tried to look at properties, the phone was gone. Any insight, advice, fixes are greatly appreciated!