I feel like this was my last week. Welcome to the UK as an American tech worker. You use a custom Android ROM, too bad, you can't setup your visa. Want to book something on Ryan Air too bad, "computer says no" (really I should never do this again for many reasons).
The level of expectation that your phone is a set of handcuffs that you do not own is high. If you own your device and not vice versa, things just don't work in this world. And honestly why would I want a computer that I didn't control anyway?