xt912_Verizon wireless intruder

Anyone else run into this?

http://answers.microsoft.com/en-us/windows/forum/windows8_1-networking/windows-81-and-rt-xt912verizon-droid-razr-texas/ca1182a0-9e56-48b8-8c9a-79c07ebd7044

To briefly recap my wireless router is setup with: SSID is not broadcasting, MAC address filtering and a long random string WPA2 key yet this phone keeps sporadically showing up in the network tab of file explorer on my Win 8.1 pc. When I click the phones properties I can see it's MAC address but the IP is blank and it never shows as an attached device by the router. Over the last few months I have also seen several other phones, a Samsung SGH-I337 and have captured the MAC's of each device. I ran the MS Malicious software tool as well as Malwarebytes but everything is clean. Anyone else experiencing this or have any helpful security tips.

Thanks.