https://sites.google.com/view/t-mobilecomsim/home

To Activate Your T-MOBILE Visite t-mobile.com/sim and Follow The Activation Process.
T-Mobile US, Inc. is an American wireless network operator headquartered in Bellevue, Washington, U.S. The company's largest shareholder is the German telecommunications company Deutsche Telekom (DT), which as of April 2022, holds 48.4% of the common stock.