I didn't know that you can also adjust the light sensitivity on the phone. That's what ISO means, isn't it? I remember that from the days of my old mechanical camera, a Pentax XP 1000, I think it was.
I wish you a cloudless sky for clear moon gazing.
On clear summer nights I have been able to see Venus with the naked eye from here. And the best starry sky I found was in the Californian desert, far out in the silence of the night. Long ago.