No, you are DEAD wrong! T-Mobile USA is owned by a giant German mobile operator Deutsche Telekom (refers T-Mobile International in Europe) has $55 billion cash cow. Compared to Sprint's cash value of stagging $12 billion. What you Americans don't know about T-Mobile International is that it dominates European coverages. It is ranked 7th world largest mobile phone company. I am pretty sure that Deutsche Telekom may consider to buy Sprint and have it merged with T-Mobile USA. Of course it has to be remained a brand of T-Mobile USA. Sad is that the T-Mobile USA coverage is so so and compare to T-Mobile International, it is so superior.
Interesting note is that a giant European carrier Vodafone owns a 45% joint of Verizon Wireless!
Further information:
List of mobile network operators - Wikipedia, the free encyclopedia