Wouldn't restore phone in ITUNES send it back to 1.1.1 and then jail break from there? Have fun in the sun in tehran!
Baseband from Bootloader 4.6 phones (sold after 1st week of Nov) cannot be downgraded via software.
Translation: phones sold after 1st week of November, once updated to 1.1.3, cannot be used as a phone on non-original carriers.