Take the mobile phone business hall APP of China Unicom as an example, and click the "My" menu item at the bottom of the page. Next, in the page that opens, click the "Security Center" menu item. Next, click the "My PUK Code" setting item.
If you use a vivo phone and forget the PIN code of the SIM card, you can take your ID card to the operator's business hall to retrieve the PIN code of the SIM card. If you have more questions, you can enter vivo official website-My-Online Customer Service-Sliding Bottom-Online Customer Service-Enter Manual Customer Service and enter the consultation.
Unlock the phone first, and click to enter the mobile phone business hall. Then log in to the mobile phone number where you want to retrieve the PIN code, and click "My" in the menu bar below. Click "Settings" in the upper right corner of this page, and then click "Security Center".
You can also set your own PIN code. Be sure to remember after setting. Once you forget it, you usually have to go after the sale. Here is a solution to forget to lock the PIN code: press and hold the power-on key+volume plus key at the same time in the power-off state, and find the item "Restore factory settings" in the pop-up dialog box to enter the recovery.
If you forget the PIN code, you can use PUK code to unlock it, but don't try it at will, because the input opportunity of PUK code is only 10 times. Once used up, you can only reissue a new SIM card in the business hall. The PUK code can be found on the big card of the SIM card, or you can contact the customer service of the operator to which the SIM card belongs.