After the Windows Spring Update, a new device is showing up in my network devices list. It is listed as T1_Plus, under "Phones." It has a Mac address. I looked on my router, and no device with that address is connected via ethernet nor wireless. I unplugged my Dahua camera (the only one I have up at the moment) and it did not go away. I looked Hisilicon up on internet and it made references to Dahua, Hikvision, and Chinese chip manufacturer. Also, I found a T1 Phone as a cheap Android Chinese made cell phone, we have no Androids in this house. I do not know if this is a hardware device or a software device, or where it is. Any help from network gurus on forum would be appreciated. Also, can I block access to the network for that Mac Address?