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SIM PUK lock, after 10 attempts (AT&T)? - crack sim puk code

Well, it's really ****** up. I left my cell phone displays, but I remembered a backup of the phone for about a week after his break. It was my sisters old (SGH-E317). I am the settings, and has reached the security settings. I usually have to enter the "After 15 minutes, or after the system PIN." I was not familiar with the PUK code, then I do not know. I thought it was a password for your cell phone like a PIN. So I have a. I came, I went to the nest of two screens (Enter enter your PIN again to confirm), and kept saying the wrong PUK. I was so stupid to give up, my 10 attempts and perma-lock my SIM card. Is it like a 'hard reset my SIM? Or should I buy a new one. NewOne If I buy one, I will have a new phone number? Do I need a new plan?