You can check eligibility and request an unlock directly through the Manage tab in the official T-Mobile app .

iPhone unlocking requires a different approach due to Apple’s activation server. VARIO acts as a bridge to Apple’s GSX server:

The VARIO Unlock Tool is a software application designed for technicians, repair shops, and advanced users to remove network carrier locks from mobile phones. While it supports multiple carriers globally, its compatibility with is exceptional.

Open the tool and log in using your purchased credentials.

Use a local SIM card to avoid massive roaming fees.

T-Mobile has one of the most stringent unlocking policies in the US. According to their official policy, you must meet several conditions: