Just a heads up on my Magic Box experience as of this weekend...
Took the MB to a cabin we frequent. This is the first time I've taken the MB, since it's on fringe B25 signal, I figured I would give it a try. The MB booted and connected promptly to the donor tower. My Pixel 2 XL connected to it reasonably fast, probably within 5-10 minutes after complete. However, my wife's Pixel 2 XL (same phone as me) WOULD NOT connect to it at all the entire 40 hours we were there. I tried doing a PRL update, Update device config, Airplane toggles, reboots, etc. It simply would not connect to the MB. Instead it bounced between B25, B26, and 3G.