Use screen width instead of height as reference for scaling orthographic size of a Unity camera. Especially useful for supporting a wide range of mobile phones.

CorrectAspectRatio.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

/* Camera usually uses screen height as their reference for orthographic size.
   This script makes it scale with width instead.
*/ 


public class CorrectAspectRatio : MonoBehaviour {
	public float targetWorldWidth = 14.5f;
	public float minWidth = 12f;

	void Start() {
		float w = Screen.width;
		float h = Screen.height;
		Camera.main.orthographicSize = Mathf.Max(minWidth, h * targetWorldWidth / 2 / w);
	}
}