ON O2 DONT KNOW IF LOCKED.GREAT CONDITION WORKS PERFECT,CANT SELL SO DONT ASK PRICE NEED ANOTHER PHONE,DAUGHTER GAVE ME THIS WHEN SHE UPGRADED I CANT GET USED TO ITUNES LINK UP ETC ON COMPUTER,I AM IN MY LATE 50s AND USED TO MEMORY CARD PHONES,HA YOUR PHONE HAS TO BE 02 OR UNLOCKED TEXT ONLY AS CANT ANSWER PHONE AT WORK.