Who knew? Siri can adjust your iPhone’s screen brightness. Just say “Make the screen brighter” or “Make the screen dimmer” and Siri takes care of it.
Notice the little slider, in case you want to do some fine-tuning.
Alternative: just say “Make it brighter” or “Make it dimmer” and Siri assumes that “it” refers to the iPhone’s screen.
Note: I just learned this one.