I'm new to Android, but my sister recently got a second-hand Galaxy S GT-I9000. It runs on 2.1, which means that it does not have Google Play. Apparently 2.2 does, and the device seems to be able to support that firmware.
When I try Google, it comes up with lots of people suggesting rooted firwmare upgrades to Jellybean rather than anything official. I'd rather not get into that just yet if there's an official route.
I've tried Samsung Kies, but it says the device is not supported for firmware upgrades. I've also tried checking
Settings > About > Software update, but 'Software update' is not there.
What is the proper way to upgrade from Android 2.1 to anything higher on a Galaxy S GT-I9000? How is it supposed to work?
EDIT: I found that it should be able to officially support Gingerbread at least. Even Wikipedia mentions that as the OS.