How do I update the OS in my device?
I have a Samsung Galaxy Ace and would like to upgrade to Android 4. How can I do that?
This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.
If your phone is eligible for an operating system upgrade, you'll see a System Update message pop up in your notification bar (along the top of the screen). You will only see this, though, when Google, your phone manufacturer and/or your cellphone provider have customized the operating system for your device.