I looked at the notes from last week and when he tried to use canyouseeme.org, the IP address came up as 64.224.xxx.xxx, which tells me it's a public address, rather than from a modem.

The link shows an image that looks like the photos I received- the copy shows 'Plug and play'.

[Link: ui.com]

Just called him- his laptop doesn't have an ethernet port, so....

I also read part of the user guide and it shows a section for port forwarding, so I think the UBNT may be in router mode.