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Are you a current or former customer of tmobile usa?
If you are check to see if you meet the requirements here and contact them to submit a request.
If you do not meet those requirements, you will not be able to get it unlocked by tmobile and will need to research alternative methods.
Actually, checking that imei on their site
It is showing blocked. You will not be able to get it unlocked without the original owner resolving the reason it is blocked for.