Please tell me what i need to do to download safari on my iphone?

What should you download for what exactly?

What are you trying to do on your iPhone?

As mentioned Safari is already installed on your iPhone. If you need to use it, just look for the icon and tap on it to open it.

Look for this icon:

To update your iPhone, you go to Settings->General->Software Update.

Nothing because you can’t download Safari on your Phone. Safari is a preinstalled app that can’t be deleted and it can only be updated when the iOS is updated.

If you are getting a message that you need to update Safari when you visits a website, that may mean that the website you are trying to access isn’t working with the latest version of Safari and the website needs to be updated to work with Safari.