override fun onServiceStateChanged(serviceState: ServiceState) {
// Get the network registration info for the voice network, which is the second of the three entries (the first appears to be Wi-Fi and the third appears to be the cell data network).
val networkRegistrationInfo = serviceState.networkRegistrationInfoList[1]
override fun onServiceStateChanged(serviceState: ServiceState) {
// Get the network registration info for the voice network, which is the second of the three entries (the first appears to be Wi-Fi and the third appears to be the cell data network).
val networkRegistrationInfo = serviceState.networkRegistrationInfoList[1]