Below mentioned are some of the cases when your device ask for PUK code: a). Post more than 3 wrong attempts of PIN, the phone will ask for PUK. b). Post multiple wrong attempt of PUK, the phone will ask for PUK 2. c). Post wrong PUK 2 attempt, the SIM would be no longer functional. Get in touch with Service Provider. If you’ve entered your PIN code incorrectly 3 times your SIM card will be blocked and you’ll be unable to make or receive calls/texts. To unblock your device you’ll need your PUK. A PUK stands for Pin Unlock Key, and you can get this by calling us on 0345 301 4455 or 4455 from a Tesco Mobile device. Where can I find my PIN and PUK code? Log in to My Vodafone and choose the section My SIM / eSIM. To enter the My Vodafone Self Care, you will need your password. In the SIM card and mobile phone section, you will see your PIN, PIN2, PUK and PUK2 codes. Please note that no one can ever find the changed PIN, as you enter it right into your The PUK1 code is a number used by Skinny for activation of SIM cards and site registration, especially for data-only devices. The PUK1 is also required to unlock SIM cards that have become locked following successive incorrect PIN entries (if you have set-up a PIN lock on your phone). Your PUK1 code is on the back of the plastic card that came Once you have your PUK code, you’ll input it in Settings > Cellular. Alternatively, it may appear when you try to access certain cellular capabilities. You should see an Enter PUK screen — enter your code here. Like SIM PIN attempts, you only get 10 chances to properly input your PUK Code. Users can also use the phone application of Cricket to unlock their devices. Open your phone app store & install the myCricket app. Open the app and let your device log in automatically. Select unlock the device and then click on Unlock. Now, your device will be unlocked and you can use it after a restart. Your sim has got a pin code and puk code for security purpose. If you use a wrong pin twice your sim will get blocked and in order to open that you should enter the PUK code given to you from Qtel with your sim card. If you lost the PUK also then contact QTel to for a new PIN and PUK but they will probably charge you. I have been given a NUK & PUK but neither work. My query was escalated to the NU Resolutions Team and I was told it would take 10 days to get the code I required. I finally felt I was getting somewhere. 10 days have now passed and I received an email from the team yesterday saying they are still waiting for a code from Samsung. i1a5QS.