![]() ![]() Scroll down to the bottom of the page, accept the terms and click on Continue.Go to AT&T’s official unlock request page.Take out your AT&T SIM and to be on the safe side, I would not turn on my device with any SIM card inserted in it until the unlock code has been received from AT&T. ![]() Here’s the complete process: Requesting AT&T Lumia 640 unlock code The process of unlocking an AT&T go-phone comprises of applying for the unlock code and then using that code to unlock your device. Steps to Unlock AT&T Lumia 640 4G LTE Go-Phone for FREE! DO NOT insert your AT&T SIM inside your AT&T Lumia 640 go-phone. We are going to do a “non-at&t customer” unlock, so we do not want it to get registered as a customer phone. IMPORTANT: Do not turn on the Lumia 640 with an AT&T SIM card inserted or it will register itself as a customer phone. ![]()
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