Many people smartly protect their SIM cards with a PIN number, because this protects intruders from using your SIM card in their own phone; they can peruse through your contacts and effectively steal your cellular and/or data service. However, instances inevitably arise where you forget your PIN number, or your SIM card is simply unresponsive. Fortunately for such cases, AT&T can provide you an unlock PIN for your SIM card and allow you to use your phone with full functionality once again. Tips Warnings Writer Bio
