How to get CellTower-ID from GeoCoordinateWatcher

I have used this :

var watcher = new GeoCoordinateWatcher(Geo开发者_JS百科PositionAccuracy.Default); 

Where Hgh means GPS and Default is the result from any of these : GPS, WiFi

I like to know :

1) Is Default refering to CellTower ID or WIFI ? any different?

2) When I turn on my App running this Watcher inside the building ( not close to any entrance or window) , I can not get any result or no Signal at all from this watcher ?

If default refer to Wifi, it should be able to get the Cell_Tower ID .

If I am closer to the window or entrance of the building, I can get the result from Watcher.

Any1 can help me on this?

Thanks

The GeoPositionAccuracy does not directly refer to use of GPS or not.

The GeoPositionWatcher provides an abstraction layer to the way that the location is resolved internally. You will never know what was used to determine the location. Because the watcher does not indicate how the location was determined, it does not provide access to information based on a specific technology which may or may not have been used in identifying the device's location.

In theory, depending on the location of the device it may be possible to get a "High" accuracy reading based purely on public wifi data.

You cannot get the cell tower ID from any of the available APIs.