can my iphone 3gs be jailbroken?

[romaan a]

hi i have just bought a new iphone 3gs 16gb on 25 march 2010 ..its an mc model and has 3.1.3 already installed on it, the firmware is 05.12.01. also the serial numbers starts with 830108....now can i jailbreak it becaus emost of the videos on youtube provide jailbreak for an accident upgrade to 3.1.3 but mine was 3.1.3 when i bought it. now what should i do .. can you plz post any links for those youtube videos which will jailbreak mine.thanx a lot .would really appreciate your help