

Let's take a look first at how to keep your SIM card from locking, and then how to unlock your SIM. Because of this, it is very important that you do not try to guess your SIM PIN or PUK code.

The only way to get your SIM card locked is by failing to enter your SIM PIN correctly three times in a row. Fortunately, running into a locked SIM card isn't something that's likely to happen by accident. This is the method you will use on most other devices.This article will tell you how to unlock a SIM card on your iPhone.

The PUK in this case is your PUK code from your provider and the New PIN is your new PIN number that you choose to use.

Click “Get your PIN unlock key (PUK)” and then wait for AT&T to locate and display your PUK code. Log into your AT&T account and click “My Wireless” and then select your locked device under My Devices & Features. Your PUK code can be obtained from AT&T by using AT&T’s online PUK tool. Verizon displays your default PIN and PUK for your device in a pop-up window. Log into your Verizon account and then click “My Devices” followed by clicking the “My PIN and Unblocking Key (PUK)” link under About My Device. You can get the PUK code for your Verizon device by either calling Verizon or using Verizon’s online tool. Follow these steps for getting the PUK code from the major providers: You can obtain a PUK code from virtually every cell phone service provider for free.
