Your provider will reply by text within a minute. They will send you your switching code, called a 'PAC', which will be valid for 30 days. Their reply must also include important information - such as any charges that you have to pay if you're leaving your contract early; or your credit balance, if you're a pay-as-you-go customer. I have given my partner my galaxy s6 when I got the phone I was told it was unlocked. My partner is with sky mobile and when he put his sim in it was asking for sim network puk code. He put in the unlatching code as this was what i was told he needed (twice) I rang o2 and they said he needs to get puk code from sky. Sky don't do puk codes. There are two main uses for a PUK code: Unblocking your device or SIM if it's been locked due to too many failed unlock attempts - for example, if you entered an incorrect PIN too many times. Unlocking your device from a specific network if it's locked to one. This may be the case if you purchased a phone from a network, although this Or, if you have an unlock code from your network provider but don't have a new SIM card, you could also try: Power off your phone. Remove the SIM card. Turn the phone back on with no SIM card inserted. On the dialling screen, enter the code: *#0000*CODE#, where CODE is your network unlock PIN. Unlock your Tesco Mobile phone. Unlock your phone with a PUK code. Unlock a device from another network. To find out if it's locked to your old network, just put your Tesco Mobile SIM card into your new device. If it doesn't work, it's probably locked. To unlock your device, just call your old network, but please note that they might charge you This pops up if your PIN has been locked and you've tried to unlock it using a Phone Unlocking Key (PUK), but it hasn't worked. If you enter a PUK incorrectly 10 times, your SIM card will be permanently blocked and you'll need to replace it. Each PUK only works with the SIM it was issued to. You can get a new SIM by chatting to us online. Select 'PUK Number'. Option 3. SMS 'VPP' to 31050 from the cellphone number that you need the PUK for. Option 4. Dial 082 135, FREE from a Vodacom cellphone, and follow the voice prompts. If your phone is already blocked then the simplest method would be to log into My Vodacom online, where you can view your PUK number from the landing page. Hi - I need a PUK code in order to unlock my SIM. I've tried following these instructions: "Or sign in to My O2, go to My device, then Device details." Once signed in, neither of those sections appear to exist. Entering my number on this page: does not work either. Get a new O2 mobile number. You can do this by simply calling customer services on 202 (Pay Monthly) or 4445 (Pay as you go). O2 will allow you one free mobile number change should you wish to change it. After that you will be charged a one off fee of £35.00 if you want to change again. Things to keep in mind: If you call to change your number The PUK code can be obtained from the carrier, after they verify you are the rightful owner of the SIM and contract. If the SIM is a prepaid, the PUK code is sometimes printed in the card holder. After you get the PUK, enter it into your phone and enter a new PIN. After this, you can unlock the SIM with the new PIN you specified. 3blLX.