I'm wondering if we should tell the user what a primary device is e.g. during the NUX. We could say something like "This is your primary device and you have to use it in order to log in on more devices".

Hmm... I wonder if this is too confusing to explain to most users, given most users only have a single phone.

In D13906 I suggested either "logged-in phone" or "primary device", but now I'm wondering if "other phone" would be best.

This would be extra confusing for users with 3 phones, but that has to be a tiny percentage of users...

Can we add some paddingHorizontal here? I think it's a bit weird how close the text comes to the edge of the screen, and it doesn't look very good to have a second line with a single word

(As an alternative to paddingHorizontal, we could consider setting an explicit width)

other phone might be confusing for the users who have only one phone. They might be wondering what's wrong with this phone so that they can't use it for login and why they need two phones. I think that logged-in phone is probably the best because it also explains that if they don't have a logged-in phone, they should use the other option.

I think it makes sense to keep it consistent with the instructionsBox and assign a fixed width