[Jason Gin] wanted to reuse the SIM card that ... access to a device largely negates any security measures the manufacturer tries to implement. [Jason] already knew what the SIM unlock command ...

Once you unlock your phone, you can choose your carrier without having ... getting a new device. Picture yourself traveling ...

Your phone's SIM card allows the device to make calls ... prevents someone from using your SIM on any phone without knowing your SIM unlock PIN. The reason for activating a SIM card lock is ...

You can sometimes get a carrier to unlock an iPhone by calling them. You could also try a third-party unlocking service such as: Doctor SIM, promises to refund you if the unlock is unsuccessful.