T-Mobile beat Wall Street on earnings, beat on revenue, and added more customers than analysts expected.
Then it told investors to look at a different number going forward.
The Numbers
T-Mobile (TMUS) reported Q1 earnings of $2.27 per share, beating the $2.02 consensus by about 12%, with revenue at $23.11 billion ahead of the $22.97 billion estimate and up from $20.89 billion a year earlier.
Shares rose about 1% to $188.50 in extended trading.
CEO Srini Gopalan, who took over in November, said in the release that the quarter was "a strong start to the year" against the company's 2026 and 2027 targets.
The New Metric
T-Mobile is no longer reporting changes in wireless customer additions - the metric the wireless industry has lived and died on for two decades.
The replacement is monthly account additions. An account can hold multiple lines, which is closer to how families and small businesses actually buy phone service.
T-Mobile added 217,000 new accounts in Q1, up 6% from a year earlier, while analysts expected about 192,860.
The carrier also raised its full-year postpaid net account addition guidance to 950,000 to 1.05 million, from a previous range of 900,000 to 1.0 million.
Why The Switch
Gopalan is reframing how investors measure the business, with the shift from line counts to account counts pushing the conversation toward customer relationships rather than phone numbers.
The new metric is harder for rivals to match, since Verizon and AT&T still report line additions. If T-Mobile's account number keeps growing faster than the industry's line growth, the company gets to argue it's signing up entire households while peers are signing up phones.
The Other Wins
Net Promoter Score - a measure of customer satisfaction - hit 45, more than 20% above T-Mobile's nearest competitor.
Broadband net adds topped 500,000, which makes T-Mobile the fastest-growing internet service provider in the U.S., as the carrier's 5G home internet product picked up speed year over year. The UScellular acquisition is also working its way through integration.
What To Watch
The big test is whether the new account metric holds up under analyst scrutiny - and whether Verizon (VZ) and AT&T (T) follow with their own changes. If account growth keeps beating the line-add story across the industry, T-Mobile wins the narrative as well as the numbers.
