In some cases, the only thing you need to unlock your phone is a software update your carrier will push to your device, and then you insert the new carrier’s SIM card and you’re good to go.

Contact your provider and request an unlock using the contact details and online tools listed below. If you haven’t got the original SIM, you’ll need to reset the phone before it can be unlocked.

[Jason] already knew what the SIM unlock command would look like; he just needed to capture the exchange between the WF721 and SIM card, find the correct byte sequence, and look at the bytes ...