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A PUK (PIN Unlock Key) code is required to unlock SIM cards that have become locked following three successive incorrect PIN entries. If your SIM card becomes locked, you will need to get a PUK code from AT&T to unlock your SIM card.
You can obtain your phone's PUK code from AT&T by:
You can unlock lg gt540 from emergency mode by inserting your puk code. PUK code can you obtained from sim card package or you can request from your network provider. If puk code still can't unlock lg phone you need to reflash your phone at mobile repair shop.
i went to put a pin codes on my phone which is a lg xenon gr500 and then when i went to confirm it it asked me for the PUK code and didn't know what it was and it wouldn't let me go back so i used all my 'tries' up and now all it will allow me to do is call an emergency number which happens to be 911 and i dont want to call 911 so what do i do
PUK is the domain of the service provider. The default is 00000000 (eight zeros). If entered wrong five or more time it locks the SIM card and you have to contact the helpline of the service provider to get a new PUK. So, do that now and get a new PUK. The 911 is to call the emergency police number.
Friend, just try to press the numbers on the pad. If it doesn't work. contact the network provider to open the line. but when they say it is already opened. then you need to reflash the phone because the software is already locked or corrupted. or it can be unlocked when using the software unlocker such as NOKTOOL.and etc. You can browse the www.twister.com for more info.of how.