Both were officially done so the unlocks are permanent and I've never had any issues with restoring or updating the software. I can't vouch for other vendors as I've never used their service and hence, don't know if they're reliable, but using the site provided, I unlocked my iPhone 4s and iPhone 4 at $45 each (which isn't bad at all considering a lot of companies out there are charging over $100 for the same exact service). If any of you need the service you can check out the site I used. You will have to go through 3rd party vendors that offer factory unlocking service instead. Took about a month of waiting before I was told I was denied. If you're not an AT&T customer like me, tough luck. And even then, they might reject you for whatever reason. For instance, your account has to be in good standing, and you'll also have to be out of contract. Your phone is now carrier unlocked and can be used on another network. As your phone had to be unlocked by AT&T, then it must have been carrier locked to AT&T.

They have a long list of criteria that you have to meet before they're willing to release the unlock to you. A factory unlocked phone is a phone that comes unlocked from the manufacturer and should be able to be used on all carriers. If you're trying to get your phone unlocked thru AT&T, be warned that it's not easy.

Is att iphone 6 plus factory unlocked