Mobile Device Unlock: Microsoft Lumia 640

Learn how to use the Mobile Device Unlock code of the Microsoft Lumia 640.



SIM unlock phone

  1. Determine if your device is eligible to be unlocked: Unlock your wireless mobile device.
  2. Contact Customer Care to request the Mobile Device Unlock code for your phone.
  3. Turn on the phone with the non-T-Mobile SIM card. The device displays "Please input unlock code."
  4. Enter the unlock code. If successful, the device displays "Phone is unlocked."
  5. If you receive any error messages after attempting to permanently or temporarily unlock your device, contact customer care to inform them of the issues you are receiving.