i deleted my phone icon on the bottom of my 13 i phone by mistake. I am anew user.

The Phone app is not one of the apps that can be deleted but it can be removed from the home screen. Go to the App Library (swipe left past your last home screen). From there you can touch and hold an app and slide it left back to the home screen.

Also note the Search window at the top of the App Library.

All you did was remove it from the Home Screen. To bring it back, follow these steps:

1. Go to the Home Screen
2. Swipe left until you get to a menu that looks like several folders. This is your App Library.
3. Scroll down until you see the Social folder.
4. Hold down on the app, until you see the multiple actions.
5. Now start moving it, and drag it to the location where you want the phone app to be.
6. Now you should be able to use it like usual.

Since your new to iPhone, I recommend you try out the iPhone user guide here:

iPhone User Guide - Apple Support

Hopefully this helps you!