First of all, you will need to post it in the correct section of the forum. This is iPad section!
You didn't give us much information of your iphone. What iPhone is it? What firmware is it on? Do you need to unlock?
You can save the 'SHSH' in cydia. If you haven't done it then you are out of luck because Apple is no longer signing other firmware other than 4.1 and 4.1 can't be JB yet.