How google map fetching address even android device is offline

I just created a map activity with some markers and while click on marker title fetching address of marked position for educational purpose,Everything works fine.

It's fetching address even if device is not connected to internet. I didn't given internet permission in manifest. ACCESS_FINE_LOCATION is the only permission given to the app.

My Question is: How application able to get address even device is in offline mode? What's the idea or technology behind it!!?

Nb: I never used getLastKnownLocation method in my code. Both Wifi and gps off and no sim card inserted.

Here is my code :

    public class MapsActivity extends FragmentActivity implements OnMapReadyCallback {

    private GoogleMap mMap;
    TextView mapPosition;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_maps);
        mapPosition = (TextView) findViewById(R.id.textplace);

        // Obtain the SupportMapFragment and get notified when the map is ready to be used.
        SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
                .findFragmentById(R.id.map);
        mapFragment.getMapAsync(this);
    }


    /**
     * Manipulates the map once available.
     * This callback is triggered when the map is ready to be used.
     * This is where we can add markers or lines, add listeners or move the camera. In this case,
     * we just add a marker near Sydney, Australia.
     * If Google Play services is not installed on the device, the user will be prompted to install
     * it inside the SupportMapFragment. This method will only be triggered once the user has
     * installed Google Play services and returned to the app.
     */
    @Override
    public void onMapReady(GoogleMap googleMap) {
        mMap = googleMap;
       // double lat = Double.valueOf(8.524139);
        // Add a marker in Sydney and move the camera
        LatLng sydney = new LatLng(-34, 151); LatLng ind = new LatLng(8.524139, 76.936638);
        mMap.addMarker(new MarkerOptions().position(sydney).title("Marker in Sydney"));
        mMap.addMarker(new MarkerOptions().position(ind).title("Marker in Trivandrum"));
        mMap.moveCamera(CameraUpdateFactory.newLatLng(ind));

        mMap.setOnMarkerClickListener(new GoogleMap.OnMarkerClickListener() {
            @Override
            public boolean onMarkerClick(Marker marker) {






                return false;
            }
        });

    mMap.setOnInfoWindowClickListener(new GoogleMap.OnInfoWindowClickListener() {
        @Override
        public void onInfoWindowClick(Marker marker) {
            Geocoder geocoder;
            List<Address> addresses;
            geocoder = new Geocoder(MapsActivity.this, Locale.getDefault());

            try {
                addresses = geocoder.getFromLocation(marker.getPosition().latitude, marker.getPosition().longitude, 1);

                // Here 1 represent max location result to returned, by documents it recommended 1 to 5

                String address = addresses.get(0).getAddressLine(0);
                // If any additional address line present than only, check with max available address lines by getMaxAddressLineIndex()
                String city = addresses.get(0).getLocality();
                String state = addresses.get(0).getAdminArea();
                String country = addresses.get(0).getCountryName();
                String postalCode = addresses.get(0).getPostalCode();
                String knownName = addresses.get(0).getFeatureName();
                String countrycode = addresses.get(0).getCountryCode();

                mapPosition.setText(""+ address);

            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    });

    }
}