Demand for its 5G wireless service and devices was the driver, the company said.
That’s compared with its prior forecast of 4.4 million to 4.9 million.
While T-Mobile’s 4G online grid often performed well in speed tests, it lacked sufficient online grid coverage.
This made it difficult to compete with rivals AT&T and Verizon.
T-Mobile is also getting ready to start a wireless home-internet service that could steal business from cable companies.
