How to jailbreak iPhone 4S, with iOS 9.2.1?

I have an iPhone 4S, but I use it as an iPod. It's running iOS 9.2.1 Is there a way I can jailbreak it with a computer using iTunes?

Added (1). I read there's not a way to jailbreak iOS 9.2.1 but can I still jailbreak it using like a iOS 9 jailbreak?

You already answered your question in your update: "I read there's not a way to jailbreak iOS 9.2.1"
You can use every single jailbreak tool ever released, and none will work until there's a 9.2.1 jailbreak.
And iTunes isn't really used in jailbreaking. It was in the past when you could use custom ipsw files, but not anymore.