Can an iphone 3g sim card work in a jailbroken and unlockediphone 3gs?

My iphone 3g is dead, it is broken. Can I just take the SIM card, jailbreak a 3gs, then unlock it and just use my old sim card?|||Yes you can, you might not even have to unlock the iphone 3GS if you get it locked to the carrier you are with AT THE MOMENT. Hope this helped :).|||Absolutely. actually did that a year back for my grandma, though she got the 4 so I had to cut it down to a micro sim.|||yes