I think you may be confusing some terms in your post.

D-GPS is "Differential GPS" (http://en.wikipedia.org/wiki/
Differential_GPS) which is an enhancement to the standard satellite
based GPS using ground stations. It has nothing to do with the network
location service that uses cellular towers and wifi locations to
determine a quick and rough fix in Android and other mobile OS's.

The GPS service Android devices use requires access to the satellite
based system, usually meaning an outdoor location, Network location
services work anywhere a carrier based connection can be found. In
addition, I believe that wifi hot spots, at least those that are in
the database accessed by the Android OS, will provide a location as
well, even without a carrier based connection.

-John Coryat

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