URGENT!!NEED HELP!!!

I got a question, hope can get help and advice from here.

I have just signed my offer letter today and after one hour later, my dream job called me and said has offered me the job.

so is it possible I terminate the offer letter that i signed by just give a call to that company tomorrow?

thanks~

This post has been edited by QuietBelL: Jun 25 2009, 09:11 PM