Curiosity drives exploration.
The ProCamera app, and many others, on the iPhone 6S, allows manual control of ISO, Shutter Speed and more.
And what about these other two lenses in my pocket?
iPhone 6S, iPro 2x Tele, ISO 32, 1/15, f:2.2
iPhone 6S, iPro .45x Super Wide, ISO 40, 1/15, F:2.2
iPhone 6S, iPro .45x Super Wide, ISO 25, 1/350, F:2.2