# Executing in Background

If you want to call the `telephony` methods in background, you can do in the following ways.

**1. Using only Telephony.instance**

If you want to continue using `Telephony.insatnce` in the background, you will need to make sure that once the app comes back to the front, it again calls `Telephony.insatnce`.

```dart
backgrounMessageHandler(SmsMessage message) async {
    // Handle background message
    Telephony.insatnce.sendSms(to: "123456789", message: "Message from background")
}

void main() {
  runApp(MyApp());
}

class _MyAppState extends State<MyApp> {
  String _message;
  // This will not work as the instance will be replaced by
  // the one in background.
  final telephony = Telephony.instance;

   @override
  void initState() {
    super.initState();
    // You should make sure call to instance is made every time 
    // app comes to foreground
    final inbox = Telephony.insatnce.getInboxSms()
  }
```

**2. Use backgroundInstance**

If you cannot make sure that the call to instance would be made every time app comes to foreground, or if you would prefer to maintain a separate background instance, you can use `Telephony.backgroundInstance` in the background execution context.

```dart
backgrounMessageHandler(SmsMessage message) async {
    // Handle background message
    Telephony.backgroundInstance.sendSms(to: "123456789", message: "Message from background")
}

void main() {
  runApp(MyApp());
}

class _MyAppState extends State<MyApp> {
  String _message;
  final telephony = Telephony.instance;

   @override
  void initState() {
    super.initState();
    final inbox = telephony.getInboxSms()
  }
```