To unblock your SIM, you'll need to key in your PUK. Find out how to retrieve the PUK. The display tells you that your SIM is blocked. Key in the PUK. Press New PIN code . Key in a new four-digit PIN and press OK . Press the field below "Confirm PIN Code" . Key in the new PIN again and press OK . The phone is ready for use. When your SIM is locked, it will ask for a PUK code. If you think you can Google the PUK code of your operator, let me tell you it is a terrible idea. Entering the wrong PUK code 10 times will permanently lock your SIM. The only option then is to go to the network operator and get a brand new SIM card for your iPhone. SIM Locked on iPhone: How PKU stands for phenylketonuria. It is a rare disorder that prevents the body from breaking down part of a protein called phenylalanine (Phe). Phe is in all foods that contain protein, such as milk, meats, and nuts. It's also in an artificial sweetener called aspartame. If you have PKU and eat foods with Phe, the Phe will build up in your blood. PUK stands for Personal Unlocking Key. It is an eight-digit code that is used to unlock a locked SIM card. If unfortunately, you forgot your PIN, the PUK code will save you from losing all your information and having to buy a new SIM card. Let's find out much more about the PUK code. How can I get my PUK code? The Mobile Station ISDN Number (MSISDN) is the complete phone number, including the country code, of a piece of mobile equipment used to complete voice calls and route SMS messages. Ki and ADM keys. These two codes are used by the network to authenticate a device. The Ki key is a cryptographic code associated with a subscriber. The PUK code, which stands for "Personal Unblocking Key", is an 8-digit code that must be entered to unlock cell phones and allow them to access the network again and completely after the PIN of the SIM card in use has been incorrectly entered more than 3 consecutive times. .

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