In these cases, Metro by T-Mobile will send a notification to the device within two business days of it becoming eligible, with next steps to complete the unlock process. Some devices cannot be remotely unlocked by Metro by T-Mobile. Once a device becomes eligible for unlocking (eligibility requirements are described below), Metro by T-Mobile will automatically and remotely unlock the device within two business days if the device supports remote unlock. Metro by T-Mobile’s approach to device unlocking

In order to unlock a mobile wireless device that is not sold or authorized by Metro by T-Mobile, you need to contact the mobile carrier or manufacturer that sold you the device. If you purchased your device from Metro by T-Mobile or if you have a Metro by T-Mobile authorized device, please follow the steps outlined below to determine your eligibility for device unlocking. We're committed to providing you with clear information about unlocking your mobile device.

Most mobile devices are programmed to prevent the device from operating with other wireless carriers’ networks without first being unlocked.

T mobile network unlock code