It's possible that these may be your phones. I suggest seeing if you can match the MAC Address for any of the "Shanghai" devices to the MAC address on any of your phones.
You can view the MAC in xFi by selecting the Device > Device Details.
To check the MAC Address on an Android phone:
I hope this helps.
I have 23 hosts including a roomba and cannot connect or reset the router to upgrade services. It restarts randomly and TV goes out several times per day and I can’t access email or admin settings because you suspended my account and I am being charged for services that I never added. Jn short: you allowed a perfect stranger to take admin privileges over my network <Edited for violating forum guidelines>