Android / Get Phone Number, Carrier Name on Android 19-29

 override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_main)

    val tm = getSystemService(Context.TELEPHONY_SERVICE) as TelephonyManager
    log("======================================")
    if (if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            checkSelfPermission(READ_PHONE_STATE) == PackageManager.PERMISSION_GRANTED
        } else {
            TODO("VERSION.SDK_INT < M")
        }
    ) {
        log(tm.line1Number)     // +821011112222
    }
    log(tm.networkCountryIso)   // KR
    log(tm.networkOperator)     // 45080
    log(tm.networkOperatorName) // KT
    log("==========================================")
}

<uses-permission android:name="android.permission.READ_PHONE_STATE"/>