Get Latitude and Longitude without inserting Sim Card and Start/Stop Gps from Application

I am trying to fetch Gps latitude and longitude, but i am having a query that whenever i try to fetch Lat & Long without sim card, it is not providing any info where as soon i insert my sim card, it provides me all information in desired manner.

LocationManager mlocManager = 
    (LocationManager) getSystemService(Context.LOCATION_SERVICE);

LocationListener mlocListener = new MyLocationListener();

mlocManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,
                                   0, 0, mlocListener);

you can see though i m using GPS_PROVIDER, it is not giving me Lat & Long without Network Operator help, can anybody tel me?

Another thing is How to start and stop GPS from an application means i wanna start gps after particular time and than as soon i get beslocation, i can turn it off.

Solution

You don't need to have access to any network to get a GPS location on Android. But an internet connection speeds-up the location fix from about 5 minutes to 5 seconds (approximately)! This improvement is brought by Assisted-GPS (A-GPS), as opposed to standalone-GPS.

GPS phones (including Android devices) check if a network connection is available. If so, they download assistance data from and A-GPS server and use it to compute the location fix with the GPS chipset. If not, the GPS chipset has to download the data from a GPS satellite, which takes a long time (rate is 50 bits per second!). The process can also be sped up if a GPS location has been computed not too long ago.

So first:

check that you have added ACCESS_FINE_LOCATION to your manifest's permissions
check that GPS satellites are enabled in the phone's settings
check that you are not indoors (signals from satellites 20,000 km above do not like roofs and walls)

Then start your app and wait, there can be a few minutes before the first fix is available.

As for starting the GPS from your app, it seems possible (see How can I enable or disable the GPS programmatically on Android?), but I don't know how! At least you can download Tasker and program it to start/stop the GPS.