Android :: Service Stops Running In Standby Mode

I'm trying to log the phone's cell movement. So I created a PhoneStateListener that is being called when the CellLocation has been changed. Then it informs a logging service to write that new cell information to a log file.

This works as long as the screen is on. But when the screen goes off, the logging stops.

I have two classes:

The PhoneStateListener gets loaded on boot time public class CellStateListener extends PhoneStateListener { public void onCellLocationChanged(CellLocation location) {...this is the logging service which is informed when the cell location changes listener.onCellChanged(mcc, mnc, lac, cid); ... }