Just plug your sim card and phone with computer, then use a data transfer tool, back up the sim card files on computer, and trsnfer it to your new phone easily.
Here is a smart tool for you: Prominent Samsung Messages Backup Software
What is a PUK and how do I get my phone unblocked?
A PIN Unlock Key (PUK), also known as a Personal Unblocking Code (PUC) is used to reset a Personal Identification Number (PIN) that has been forgotten or lost. Most mobile telephones offer the feature of PIN protection. After switching on the phone, if the PIN security function is active, the user is requested to enter a 4-8 digit PIN enabling the phone's non-emergency calling functions. If the wrong PIN is typed in more than three times, either the SIM card, the device, or both become locked. They can be returned to their original unlocked state by entering a PUK, provided by the service operator after verification. If the wrong PUK is entered ten times in a row, the device will become permanently blocked and unrecoverable, requiring a new SIM card. Cellular phone users are therefore advised by most providers to keep their PUK written down in a safe place separate from the device. The PUK (PUC) is a SIM-specific code assigned by the service provider. It is near-impossible to guess and enter it; thus, if a user does not know his or her PUK and is prompted for it, it should be obtained from the service provider. Once you enter the PUK code, you must set a PIN. The PUK and PUK2 are used to unlock the PIN and PIN2 codes respectively if your SIM card is blocked.
You can't unlock a Samsung Galaxy ACE for free. But you can unlock a Samsung Galaxy Ace at affordable cost using unlock code. You can get the unlock code for your mobile from www.mobile-unlocker.com all the best mate.
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Some Samsung users worry about restoring Samsung data, like photos, contacts, text messages, videos, WhatsApp chat history, Viber messages and other documents. Do not worry now. You can follow these tips below to help Samsung backup and restore.
If you don't have backup, you may need a third party software to recover your lost or deleted Samsung data. For Mac users, you can try Android Data Recovery Mac. For Windows users, you can try Samsung Data Recovery. Both of them offer you a simple and safe way to recover lost contacts, text messages, photos, videos, audio, WhatsApp messages, Viber messages and etc from Android phone internal memory and SD card.