Hummer joined Vodafone in 2011 before assuming his current position in April 2024. In May 2024, Vodafone revealed its “virtual wheeling” agreement with Eskom in Africa, which allows the company to buy renewable energy from independent producers. In February 2024, Vodafone and Edgnex Data Centres by DAMAC announced the establishment of a data center in Türkiye with an estimated investment of $100 million. Hummer has also been the regional head for the Middle East and Africa since mid-2023. He is currently a visiting professor at Central European University.