How do I set the screen size of my game to fit into a phone screen?

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Hello guys

I am new to unity and I am planing to code a small iOS App to learn how unity works.
How can I set the Screensize of my game to be equal to an iPhone screen size. I want my game to be 750x1335 Pixels. Ive looked into the “Main Camera” but I didnt see any option to set the size of my camera.
Since different iPhones have different Screen-Sizes I am guessing I need to set it in code (c#).
Thanks you

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