What is the correct way of checking for mobile network available (no data connection)

Question

What is the correct way of checking if a mobile network (GSM) connection is available on Android? (>2.1) I don\'t want to check if there is data connection available over the mo

Answer 1

I was looking during a long time for an effective solution to know if devices has access to a mobile network (not data network).

Viktor's answer is a very effective solution : https://stackoverflow.com/a/6760761/11024162

If you only want service state at a precise moment, you can unregister listener in onServiceStateChanged callback. Like this :

private inner class PhoneListener : PhoneStateListener(){
override fun onServiceStateChanged(serviceState: ServiceState?) {
    if (serviceState?.state != ServiceState.STATE_IN_SERVICE) {

        //Behavior when no mobile network

    }
    //unregister listener after one callback call
    //phoneListener is the PhoneListener you previously create to register listener
    val tel = requireContext().getSystemService(Context.TELEPHONY_SERVICE) as TelephonyManager
    tel.listen(phoneListener, PhoneStateListener.LISTEN_NONE)
}

}