Can Iphone apps update by themselve?

Can apps i don't have on my phone any longer update by themselves still even if i haven't had the app for a long time?

If it isn't downloaded on your phone, it can't be updated. When you download the app, it gets all the things it needs to add the app to your phone but it doesn't update anything unless it is downloaded on your phone.

When you want to redownload them directly to the phone the most recent version is what you'll get.

Yes they can.

If you ever decide to download an app you uninstalled again, you will get whatever the most recent version of the app that is currently out

I think there's a setting that can make it do that