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The PUC (PUK) is a SIM-specific code assigned by the service provider. - Personal Unblocking Code (Wikipedia) That means you cannot change it with help of your android device. If you want to crack it you must watch this video Video is about 'Rooting The Sim' by Karsten Nohl at BlackHat 2013. In this video Nohl showed vulnerability that almost ...


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if phone didn't ask for code it means your device was unlocked. You will not be screwed. i also requested for the code for my at&t samsung galaxy s2 phone, they denied because i was not an owner of phone so used : www.attlumiaunlockcode.com now phone is unlocked & using with T-Mobile. Thanks


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I have solved the problem myself. Reason of the problem was Invalid IMEI number. What I did is set the valied IMEI for Sim. Steps to Change IMEI Number of Your Android Write the following in your dialler – *#7465625# or *#*#3646633#*#*. (*#*#3646633#*#* this work for me) Click to Call pad or connectivity options. Find out CDS information and tap on it. ...


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If your sim card is locked then you can just remove it and put another one in. If the phone itself is locked, you can do a factory-reset by using the recovery, hold power, home, volume-up until you get to the recovery screen and choose the factory reset option.



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