# getDeviceId

Retrieves the unique device identifier.

## Syntax

```dart
Future<String?> getDeviceId()
```

## Returns

- `Future<String?>` - Returns the device ID as a string, or `null` if no device ID is available.

## Example

```dart
String? deviceId = await SfmcSdk.getDeviceId();
if (deviceId != null) {
  print('Device ID: $deviceId');
} else {
  print('No device ID available');
}
```

## Notes

- The device ID is used internally by the SDK to identify the device.
- This ID may be different from the system push token.