The initial password of PIN code is 1234. In order to protect your safety, Unicom mobile phone card is equipped with PIN code and PUK code protection. The password of the SIM card is initially set to 1234. If the error code is entered three times in a row, the card will be locked. At this time, you need to enter the PUK password to unlock it. However, after entering the error code 10 times, the SIM card cannot be recovered. You can log on to the online business hall /e3/? After entering, click the villain icon in the upper left corner to display your PUK code information. ?