But now Google has started rolling out update for Galaxy S and Galaxy Nexus, as its in rolling out phase not every user has got it, it will take some time for you to get this update.
If you wanna update your phone now then you can follow some simple steps :-
- Navigate to Setting-APPS->All,
- Now scroll down and find Google Services Framework and tap on it,
- Tap on Force Stop option and then tap on Clear Data,
- That’s it, now move to Settings->About Phone->System Update and you will see notification regarding the update.
PS :- Some users might not be able to get this trick working