Hey, thanx for making the dream of physical keyboards on smartphones once again come true. I couldn't help but notice, using the google-calendar in landscape is fine, until you create or edit an appointment, the display picture then flips in vertical mode (physical keyboard still deployed). And it happens either in auto-mode, as well as in manual rotation mode. (As a small reference the old Droid4 with a Lineage OS, doesn't flip.) Cheers!
For Germany 1&1 LTE- and E-Net: I had to add-in the APN, which can easily found on the carriers website. Took a while until I figured out this was causing my initial problem: Phone calls working, SMS working, but no data service at all. Now it's seems like this was the only missing gap regarding network configuration. 😃