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Your phone is de-branded and now has the T-Mobile ROM (along with Band 12 support)ĭifferent ROMs are available here, here and here.

Hold down the power button for 10 seconds or so to reboot the phone. When the phone's screen turns green, it is finished. If you install the T-Mobile ROM, it will take a while You will then be asked if you'd like to install the T-Mobile ROM, press Y or N It will de-brand the phone and then reboot the phone When you have connected the phone (and it's powered on), press Enter It will prompt you to make sure you've connected your phone to the computer Navigate to the folder where it was saved (most torrent software clients will allow you to right click on the torrent and then open the destination folder) If you don't need it, you can de-select it to download in your torrent software.įor people who don't want to use a torrent or don't want the T-Mobile ROM, I've uploaded a zip file here. The package includes the T-Mobile (US) ROM image. If you need help with the torrent, please send me a message. It's a torrent available here via torrent file.

I've built a package that tries to get all the tools and files necessary together in one place. You must have Windows Device Recovery Tool installed. After de-branding, you can then flash the ROM (custom version of the operating system) for your carrier.

Follow the instructions in the email.ĭe-branding is the process of removing the enhancements that AT&T put on the phone. In a couple of days, you should receive an unlock code. THIS IS IMPORTANT: You will receive an email with a link to confirm your request, you must click it to ensure your request is honored. The model should show as "Microsoft Mobile/640"įill in the rest of the details and click "Submit" Select the "Non-AT&T Mobility customer" optionįill in the IMEI, this is found on the label on the bottom-side of the package There's a Troubleshooting section at the end.Ĭheck the box at the bottom and then click "Continue" The phone is unlockable regardless of your location.įor an explanation of why you'd want to de-brand and flash your phone, see this answer. This guide is to help you unlock, de-brand and flash the phone. Unfortunately, the $30 phone is locked to AT&T. Very Important! Make sure to remove the AT&T GoPhone sim card before you turn on the phone! Because they're so cheap in the US, the Lumia 640 is really popular.