My iPhone is my third eye. It has a magnification program that I use. Other accessibility features I use are VoiceOver and speech. I can do anything with voice without reaching for my phone. Voice-over is always on and is really necessary for me.
I use Earpods almost all the time, so I hear everything that comes in on my phone. Most of the time I use just one, because I also want to listen to the environment.
I've set the home button as a menu choice between zoom, inverted colors, VoiceOver, and magnifying glass. Sometimes I turn inverted colors on when there is a lot of light or with a reflective screen. Then the contract is better in terms of text and I can just see it.