If your iPhone is up to date, it's not possible to jailbreak it. The latest software that can be jailbroken, is iOS 9.0.2, every software after that one (9.1, 9.2, 9.2.1) is not jailbreakable.
This thread will tell you if it's possible to jailbreak your device:
The "Can I Jailbreak my iPhone on iOS X.X.X" Thread
You'll also get some information here:
iOS 9.0-9.0.2 has been Jailbroken!!! YES!! it is released! Works on 6S and 6S+!
And here's information about jailbreaking in general:
Thinking of Jailbreaking but are not sure?
Hope that helps.
This thread will tell you if it's possible to jailbreak your device:
The "Can I Jailbreak my iPhone on iOS X.X.X" Thread
You'll also get some information here:
iOS 9.0-9.0.2 has been Jailbroken!!! YES!! it is released! Works on 6S and 6S+!
And here's information about jailbreaking in general:
Thinking of Jailbreaking but are not sure?
Hope that helps.
