I have two iPhones, one for day and one for the night.
Simplicity is about clarity of thought and being willing to stay in a problem long enough to come to a solution, though it could be right in front of you.
I don’t use a ring of any kind on my phone. This is so that I am always on offense and never defense.
My best entrepreneurial advice is to start.
Products should speak for themselves, and marketing should support that.
If I learned one thing working at Facebook: If users are trying to use your app in a certain way, get out of their way and let them.