T-Mobile US (TMUS) shares surged 5.56% on Thursday following the release of its impressive second-quarter earnings report and an upward revision of its full-year guidance. The telecommunications giant reported earnings per share of $2.84, significantly beating the analyst consensus estimate of $2.67, while total revenue for the quarter came in at $21.13 billion, surpassing expectations of $21.02 billion.

The company's strong performance was further highlighted by the addition of 830,000 postpaid phone customers, considerably outpacing the FactSet estimate of 700,300 additions. This robust customer growth prompted T-Mobile to raise its annual forecast for postpaid net customer additions, now expecting to add between 6.1 million and 6.4 million subscribers in 2025, up from its previous projection of 5.5 million to 6 million additions.

Investors were particularly encouraged by T-Mobile's increased financial guidance, with the company now expecting core adjusted EBITDA to be between $33.3 and $33.7 billion for the full year 2025. The raised outlook, combined with the strong Q2 results, underscores T-Mobile's continued momentum in the competitive telecom landscape and its ability to leverage its network advantages to drive growth, leading to the significant stock price appreciation.