Deutsche Telekom and T-Mobile US have opened early-stage discussions on a combination that would fold the U.S. wireless carrier into its German parent, Reuters reported Monday, citing people familiar with the matter.

The proposed transaction would rank among the largest telecom deals ever attempted. T-Mobile US already trades as a publicly listed company in which Deutsche Telekom holds a controlling stake, a structure established when the U.S. unit was created through the 2020 merger of T-Mobile and Sprint. A full combination would collapse that holding into a single corporate entity, ending one of the more awkward ownership arrangements in European telecom.

What did the Reuters report actually say?

The discussions are preliminary, the people familiar with the matter told Reuters. No transaction value, exchange ratio, or board approval has been disclosed. Neither Deutsche Telekom nor T-Mobile US has filed a regulatory disclosure. Deutsche Telekom declined to comment. T-Mobile US did not respond before publication.

The report does not state whether Deutsche Telekom is preparing a formal offer, which advisors are involved, or whether a transaction is likely inside a defined window. The "mega merger" framing is Reuters' characterization, not a confirmed deal structure.

What would a deal actually require?

Two structural hurdles deserve attention before anyone takes the framing at face value. First, minority T-Mobile US shareholders — the public float that sits outside Deutsche Telekom's controlling position — would need to be bought out at a premium. Deutsche Telekom cannot absorb the company on its own terms, even with a majority.

Second, the U.S. national security review would run longer than a standard antitrust clearance. Any deeper German government-linked control of a major U.S. mobile carrier would draw CFIUS attention, particularly under the current regime. Deutsche Telekom is itself majority-owned by the German federal government, a fact that historically complicates CFIUS filings.

The deal, if it advances, would require sign-off from the Federal Communications Commission, the Department of Justice, and the Committee on Foreign Investment in the United States. Expect a regulatory path measured in years, not months.

Why does the timing matter?

T-Mobile US now generates annual revenue larger than Deutsche Telekom's home-market business, a reversal from a decade ago. U.S. wireless growth has slowed as the postpaid subscriber base matures, and T-Mobile US competes in a market that includes AT&T and Verizon, both of which have spent the past two years building out mid-band 5G using C-band spectrum acquired at Federal Communications Commission auction. Deutsche Telekom, meanwhile, faces pressure at home, where 1&1, Telefónica Deutschland, and Vodafone Germany are all pressing on price.

A combination would let the parent consolidate 5G capex planning across the two footprints, though it would also concentrate exposure to U.S. spectrum and regulatory cycles inside a German balance sheet.

What should investors watch next?

The next Deutsche Telekom quarterly results call, expected in May, is the first test of whether management's language on U.S. capital structure changes. If the talks stay quiet through the summer, treat them as exploratory. If a term sheet follows the Reuters report, expect a contested minority buyout and a CFIUS review that runs longer than any previous telecom combination of this scale.