How to restore deleted apps that come with an iPhone? Such as calculator, maps, and notes?

I know there's a way to view apps that were purchased from the App Store and then deleted, but I'm wondering how to restore apps that I deleted that came with my iPhone? Like the voice memos, news, reminders, etc. I deleted some of them to make space ever since that update launched a few months back, but I kinda need one of them for a class:/ thank you!

The App Store. Should find them under Apple apps.

  • Why does my iPhone notes app.delete some notes? Some have been there for over a year others just disappear after a few days. I have not (to my knowledge) done anything differently.
  • Old GPS or iPhone maps or google maps app? I'm going to drive from IL down to SC and I don't trust my old garmin nuvï 255 nor iphone maps lol:-) GPS update is $50 which I'm not going to spend. So has anyone used iphone maps or google maps app on long distance trips? Or I just better use old gps?
  • My iPhone says that my Notes is taking up 1.79 GB of storage. I only have 3 notes, and there isn't a lot of text in them. How do I fix this? Recently there were a lot of notes on my phone, but I deleted most of them until there were only three notes left. However, my phone still says my Notes takes up 1.79 GB. I tried writing a really lengthy note to see if the GB would go higher, but it didn't change. I don't want to delete my three remaining notes, which have very little text in them. I doubt that these notes are taking up 1.79 GB. What is the problem here, and how do I fix it?
  • My iphone needs to restore and I don't want all my music and apps deleted? Okay so I was doing the software update for my iPhone and after about an hour it said the update had failed due to an unknown error. Next thing I know a window comes up on my itunes that says, "iTunes has detected an iPhone in recovery mode. You must restore this iPhone before it can be used with iTunes." and that's my only option. If I restore it, I fear losing all of my apps and music that I paid for. Is there any way I can restore it without deleting all of my music and apps?