How to get carrier unlock code for iphone 6 dont know previous owners account or pin number but the phone is clean just can't

[juliebrewer120]

Looking for carrier unlock code for sprint i phone 6 so I can use it with T-Mobile I bought the phone and its clean but sprint says I need account number and pin

 

[rgd1101]

sorry only sprint and unlock their phone
https/www.sprint.com/en/support/solutions/device/faqs-about-unlocking-your-sprint-device.html

"Customers are strongly encouraged to contact Sprint about a device's unlock eligibility before purchasing through a non-Sprint channel as Sprint cannot share any information regarding the previous account."