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")
    }
}