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  • Unlock instructions and troubleshooting.
Here is good link for T-Mobile APP unlock instructions and troubleshooting. This should help you all identify the error message and what customer should do to fix.

 


 
The only error message that should be reported to us to be redone is, Unlock Failed: This mobile wireless device is not eligible for unlock. For Device Unlock eligibility details, please go online or contact Customer Care. 
 

If you receive an error, review the following table for troubleshooting:

 

Error Message
Information / Troubleshooting
Device not recognized by your service provider. Please call customer care.
  • Rooting your device will disable the unlock application
  • Download the latest T-Mobile software to continue

Data corrupted during transfer. Please try again.

Error during data transfer. Please try again.

  • Ensure the device has stable mobile signal
  • Restart the device and try again
Server not responding. Please try again later.
  • No response is received from the server
  • Try using an alternate internet connection
Failure in processing the request. Please reboot device and try again.
No internet connection available. Please try again when internet connection is available.
  • No internet connection is available:
    • Device is not connected to 3G/4G LTE
    • A non T-Mobile SIM card is being used on a device that is locked to T-Mobile
Unable to connect to the server at this time. Please try back again later.
  • Update the app using the Play Store
  • Attempt the unlock using the mobile network.
Unlock Failed: This mobile wireless device is not eligible for unlock. For Device Unlock eligibility details, please go online or contact Customer Care.
Unlock Failed : System maintenance error, try again later.
  • System Maintenance is currently underway
  • Wait and try again later
Failure in applying the unlock settings. Please try again.
  • The device must be connected to the mobile network (including domestic and international roaming)
  • Disconnect from Wi-Fi and try again.
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