Update: Confirming previous leaks, Dortmund has officially announced a new partnership with Vodafone starting from the 2025-26 season, replacing 1&1 Ionos as the front-of-shirt sponsor. The agreement will run until 2030.

Dortmund 25-26 Home Kit Leaked - Tribute to 93-94 Kit

1&1 Ionos has been BVB's sponsor since the 2020-21 season, and the upcoming 2024-25 season is the last under the current contract. Negotiations between 1&1 Ionos and BVB have been quite difficult.
Vodafone Becomes the New Front-of-Shirt Sponsor for Dortmund From the 2025-26 Season

Beginning with the 2025-26 season, Vodafone will become Dortmund's new FOS sponsor. The deal between the two parties will span five seasons, concluding in 2030.
In the announcement video, Dortmund also revealed a glimpse of their new 2025-26 home kit, in which the Vodafone logo appears in a monochrome variant to match the overall design.
Currently, 1&1 Ionos serves as Dortmund’s front-of-shirt sponsor. The tech and telecommunications brand has been featured on BVB shirts since the 2020-21 season, making 2024-25 the fifth and likely final season under the current deal.
It’s unclear whether 1&1 will remain involved in another capacity or exit the club partnership entirely.
Do you like Dortmund's new sponsor Vodafone? Comment below.