Android : Cannot Retrieve Latitude / Longitude Without Internet Connection

I am having problem in getting the latitude and longitude on my phone.. So i create an application that only display the "Toast" once i request it to. using the LocationManager.NETWORK_PROVIDER, instead of gps. And I try it on my G1.. I found out that if the G1 is connected to my WiFi, i can get the coordinate of my position, without any problem.. once i turn off the WiFi of the phone. The onLocationChanged() is not triggered anymore, instead, onStatusChanged() is triggered.. And I get TEMPORARILY_UNAVAILABLE error.. So what i want to ask is :Is internet connection required to retrieve the coordinate ONLY?