Please find my sample solution for the exercise here:
Of course, you probably have used other phones here.

fun main(){

  val iphone = MobilePhone("iOS", "Apple", "iPhone 12")

  val galaxyS20 = MobilePhone("Android","Samsung", "Galaxy S20")

  val mateXS = MobilePhone("Android", "Huawei", "Mate X S")

}



class MobilePhone(osName: String, brand: String, model: String){

  init {

    println("The phone $model from $brand uses $osName as its Operating System")

  }

}