T-Mobile Subscriber Growth Slows: Q4 Results & 2026 Outlook

February 11, 2026 Priya Shah – Business Editor Business

T-Mobile added fewer wireless subscribers than analysts anticipated in the fourth quarter of 2025, a development signaling increased competition within the U.S. Telecom industry. The company’s performance comes as rivals aggressively pursue customers with promotional offers, according to a report by Yahoo Finance.

While T-Mobile is expected to outperform AT&T and Verizon in net postpaid phone additions for the December quarter, with projections of 964,000, the lower-than-expected overall subscriber growth raises questions about the sustainability of its recent momentum. Postpaid phone subscribers are particularly valuable as they represent consistent revenue streams and higher data usage.

As of the second quarter of 2025, T-Mobile US served over 132 million customers, solidifying its position as a leading mobile network operator in the United States. The company’s growth has been fueled by its “Un-carrier” strategy, launched in 2013, which focused on transparent pricing and the elimination of traditional contracts and fees. Key mergers, including the acquisition of MetroPCS in 2013 and Sprint in 2020, have further expanded its subscriber base and network coverage.

T-Mobile has heavily marketed the quality of its 5G network, and independent metrics support these claims, demonstrating faster median 5G download speeds and broader coverage compared to AT&T and Verizon. This advantage has been instrumental in attracting data-intensive users. The company’s financial results reflect this success, with recent quarters demonstrating strong customer and financial growth.

T-Mobile’s strategy centers on providing an unmatched combination of value and quality, alongside a commitment to customer service and innovation. However, the current competitive landscape, characterized by aggressive promotions from other carriers, presents a challenge to maintaining its growth trajectory. The company has not yet released detailed financial statements for the fourth quarter of 2025.