T-Mobile and other carriers sell customers a service that uses this information to track other phones ON THE SAME ACCOUNT. The actual service is provided by a t

T-Mobile and other carriers sell customers a service that uses this information to track other phones ON THE SAME ACCOUNT. The actual service is provided by a third party that, I assume, is privy to all customers tower contacts and thus the location. By the way, the service is usually accurate within 50 feet although I have found some bloopers where it was off by 500 feet.Each result even tells you how accurate it likely is.