I have apps for my bank - like Duke.
I have apps for my credit cards.
I have shopping apps - like Publix grocery store and CVS.
I have apps for my utilities.
I have email app.
I have game apps.
The one I probably use the most is Reddit.
The only real thing I have is the 'My Business' app on my iPhone and it's for my LD route. You need an Apple ID and password for anything and everything else you would want to download and honestly, I don't feel it's worth the hassle.
I use apps for email, ordering food, driving map and driving aids, bicycle routes, banks, finding wifi, MLB TV, finding the cheapest gas. I use my phone far more than a desktop computer.