Smartphone made my life much, much easier.
It can bring interruptions into your life, but it can also simplify and optimize other parts of your life.
I don't have a smartphone. I simply don't do most of the things on your list. I use a paper calendar and to-do list. I read paper books from the library. I had an iPhone and found that it made my life more complicated - more generally, its contribution to my life was a net negative - and I got rid of it.
Now, coming back on your point, Steve Jobs was certainly not a Minimalist himself. He (partially) OWNED a huge company, and he was totally OWNED by his company, by the definition of the book of minimalism itself. Until the end of his life he spent most of his days working for Apple -> which is not a good example of someone detached from earthly possessions. Plus, he was passionate about the products he created, therefore he certainly used them a lot and was "owned" by them as well.
That's why, putting Steve Jobs in a "Buddhic" kind of stature is ridiculous. If you want to find examples of people who live Minimalism, there are much better ones out there.