Iphone 3gs no service abroad ?

IPHONE 2G ON O2 JAILBROKEN SMASHED SCREEN BUT STILL WORKS
IPHONE 2G SMASHED SCREEN BUT STILL WORKS COMES WITH CYDIA GAMES APPS ON IT THIS IS FOR PHONE ONLY NO BOX OR CHARGER ON O2 MUTE BUTTON ON SIDE IS BROKE AND COULD BE DOING WITH NEW HOUSEING