Final answer:
A customer with a T-Mobile No Credit Check (NCC) plan can roam both domestically and internationally, with certain conditions and potential costs applicable.
Step-by-step explanation:
Yes, a customer can roam domestically and internationally with a T-Mobile No Credit Check (NCC) plan. Domestic roaming allows users to connect to partner networks when T-Mobile's network is not available. For international roaming, the NCC plan typically offers service in various countries, but it's important to check the specific details of the plan as roaming rates, availability, and features can vary. Customers should contact T-Mobile or review their service agreement to understand the roaming capabilities and potential costs associated with their NCC plan.