Hello,
Unfortunately, you cannot film/photograph vertically with the first generation. This is only possible with the new one, which is also better suited for larger smartphones.
With this one you can: Dji Osmo Mobile 2
If you are willing to spend that much money, this one might also be worth considering: Dji Osmo Pocket (12MP, 60p, Grey)

If I could help you with my answer, I would be very happy about a click on "Accept this answer" :)