Source: https://www.t-mobile.com/company/company-info/sim-unlock-policy/unlock-your-mobile-wireless-device.html?irgwc=1&cmpid=WTR_AF_&clickid=TzzWucxkgWuGwEZwwGxPo1IRUkj10q3HcQXMT00&iradid=187812&irpid=159229&ircid=3290&affiliate=Axel%20Ltd%20Co%20%28dba%20MobileNations%29&sharedid=&aam=aam_uuid&invoca=invoca_experience