Can i update my iPhone 4S to iOS 6.1.3?

I'm using iPhone 4S. I bought it in US and It is Gavey unlocked. I'm using it with Vodafone India Sim now. I heard that i should not update the software since it is not fully unlocked. But today, i have jailbroken my iPhone. Is it safe to update to iOS 6.1.3 now?

Yes you can update up to iOS 7… That's fine. I got iphone 4 and It is updated iOS 7. Try it now.Trust me Bro. Goodluck. It only minutes… Depending on your internet connection.

You can only update to iOS 7
And if you updated your iPhone to iOS 7 you will lose jailbreak and your phone properly will be locked (if it's not factory unlocked)
Be careful!

You could, but you will lose the jailbreak. As far as the unlock, it may go as well. Not sure entirely.