内部类不用static修饰无法实例化

今天在学习的时候我发现定义的内部类如果不用static修饰的话是无法调用构造器实例化的，这是为什么？
而且如果内部类先于外部类被加载进内存，那不是越俎代庖的行为吗？

 class Example2 {
      class Telephone {
         String brand;
         String number;
         double dialledTime;
         double rate;
         double balance;

         public  Telephone(String brand, String number, double balance) {
             this.brand = brand;
             this.number = number;
             this.balance = balance;
         }

         public Telephone() {

         }

         public void recharge(double cost) {
             balance = balance + cost;
             System.out.println("冲值后的余额：" + balance);
         }

         public void callCost() {
             double callcost = dialledTime * rate;
             balance = balance - callcost;
             System.out.println("话费：" + callcost);
             System.out.println("余额：" + balance);
         }

         public void display() {
             System.out.println("电话品牌：" + brand + "电话号码：" + number);
             System.out.println("通话时间：" + dialledTime + "费率：" + rate);
         }
     }
    Telephone tel  = new Telephone( );
//    Telephone tel;
    public static void main(String[] args) {
        Telephone tel;
        tel = new Telephone("TCL", "8309600", 100);
        tel.rate = 0.2;
        tel.dialledTime = 150;
        tel.display();
        tel.callCost();
        tel.recharge(50);
    }

}

内部类不加static只能声明该类的指针或引用。
static代表该类所有对象所共有，它好像是在类加载后再构造的。