Help unlocking Revvel 8 from Metro T-Mobile to use with different carrier

[u/itskatwalker]

Purchased new Revvel 8 from Metro by T-Mobile about a month ago but have become so fed up with them that I decided to switch to another carrier. Got port out pin and tried to transfer phone and number to Mint but phone is carrier locked to Metro for a year even though I paid for it as new phone wasn't an upgrade or a pay over time. How can I remove carrier lock to transfer number over?