My application uses iPhone's GPS functionality, and it was working fine previously, as in it prompts user to allow the use of location services and it shows up under Settings > Location Services list. I uninstalled and re-downloaded the app from the app store, but it no longer does either of them. The app was of the same version, and hasn't been updated for a while, but the problem had started recently.
The problem has been found in multiple devices (iPhone 3GS, iPhone 4, iPhone 4S) running different OS (iOS 4-5). Did Apple change how Location Services work recently?