I don’t think that number is correct. T-Mobile’s net income in 2021 was $3.024 billion. I think you might be confusing the first number on the page (postpaid revenue of $42.562 billion) for profit.
Their 2023 annual report does report an “adjusted EBITDA margin” of 47% for 2023. But their net income margin is 13%. They are borrowing money to upgrade their network for each new technology, so I think it’s fair to include depreciation and interest when measuring the profitability of their business.
You know the conversation went like: "You can give us 600M fine and we will pay it, or you can give us 60M fine and we will forward another 20M to you."
I'm sure they're crying.