Sim on my iphone 3GS locked by accident. I do have an att account with this phone

My 3GS Iphone Sim locked by accident. it says to unlock- call my service company which is att-- to get the PIU? I have had iphones through Att for the last 6 years-- I cannot use my phone to call at-t because it is locked. 

You can get the PIN Unlock Code (PUK) by logging in to your account www.att.com. Go to My Phone/Device and click "Unblock SIM card".

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