1&1 concludes a national roaming agreement with Telefónica and can thus already offer its customers nationwide wireless connections during the roll-out phase of its 5G mobile network. In addition, 1&1 expands its presence in sports sponsorship and becomes a partner of the Formula 1 team Haas F1 and wins Mick Schumacher as a 1&1 brand ambassador.

1&1 Drillisch AG has been operating under the name 1&1 AG since June.

1&1 becomes the main and shirt sponsor of Bundesliga soccer team Borussia Dortmund. Together with BVB, 1&1 creates and produces new, creative social media formats.

The 1&1 Service Card is launched as an extension of the 1&1 Principle and now also offers a priority hotline. This year, 1&1 also wins connect Festnetztest.

1&1 successfully participates in the 5G frequency auction, laying the foundation for the construction of a high-performance mobile network. The aim is to build Germany's most advanced 5G network - fully virtualized and based on OpenRAN technology.

1&1 continues to expand its partnerships with municipal network operators and launches the marketing of fiber-optic home connections. This enables 1&1 to provide Internet bandwidths of up to 1,000 MBit/s for downloads.

1&1 is expanding its service offering with the 1&1 Exchange Service: In the event of damage, customers receive a new smartphone within just 24 hours. In addition to the usual device warranty, this also applies to self-inflicted damage such as display breakage or water damage. This is unique in the industry!

1&1 Telecommunication SE and Drillisch AG jointly form a strong fourth force in the German telecommunications market - today's 1&1 AG - which now includes the discount brands of Drillisch Online in addition to 1&1.

1&1 again wins the prestigious connect Festnetztest.

1&1 Internet SE splits into two business units: 1&1 Telecommunication SE, which continues to operate the Consumer Access business (DSL & mobile communications), and the internationally active Business Applications business unit with the current IONOS brand for hosting and cloud service.

United Internet AG increases its stake in fiber-optic network operator Tele Columbus to 25.1 percent, making it the company's largest shareholder.

1&1 is part of the "Wir zusammen" initiative and supports refugees in starting their careers

From now on, 1&1 is also offering DSL rates for business customers. Small businesses, the self-employed and freelancers can now choose between different 1&1 business rates.

1&1 wins the prestigious connect Festnetztest for the first time and is the only provider to receive the grade very good.

1&1 also inaugurates its new logistics center in Montabaur. Around ten million shipments can be processed here every year.

With the takeover of leading fiber-optic provider Versatel by United Internet AG, 1&1 gains direct access to one of Germany's largest fiber-optic networks. Versatel becomes 1&1 Versatel shortly afterwards.

1&1 celebrates its 25th anniversary!

In this year, 1&1 agrees to cooperate with E-Plus Group (now Telefónica Deutschland) on mobile services. Through a so-called MVNO agreement, 1&1 gains access to Telefónica network capacities and can use them for its own services and applications.

United Internet AG, which also includes 1&1, acquires a strategic stake of 25.1 percent in the fiber-optic provider and telecommunications specialist for corporate customers - Versatel.

With the launch of the 1&1 Principle, 1&1 offers new and existing customers clear performance promises and continues its quality drive in DSL and mobile communications.

1&1 and Vodafone sign Germany's first MVNO (Mobile Virtual Network Operator) contract. This enables 1&1 to offer its own mobile Internet rates based on the Vodafone network.

The 1&1 mobile offering with the innovative All-Net-Flat for calls to the German fixed network, SMS and mobile Internet is launched.

1&1 takes over the DSL business of freenet AG and migrates around 700,000 former freenet DSL contracts.

Marcell D'Avis becomes the face of the 1&1 quality offensive as Head of Customer Satisfaction. At this point, he has already been working at 1&1 for 16 years and is responsible for 1&1 service quality.

At CeBIT 2008, 1&1 presents the 1&1 MediaCenter, laying the foundation for today's portfolio of attractive value-added applications. For the first time, online content can be combined with the customer's own content in their own living room - and at a price suitable for the mass market.

1&1 and Deutsche Telekom also sign a cooperation agreement for high-speed VDSL.

1&1 offers complete DSL packages for surfing and telephony without a Deutsche Telekom connection for the first time.

Ralph Dommermuth establishes the "United Internet for UNICEF" foundation. Together with its customers, 1&1 has since been actively committed to the goals of UNICEF - the United Nations Children's Fund.

1&1 launches the first flat rate for DSL telephony in Germany. Over the course of the year, similar rates are introduced by all German DSL providers. This year sees the breakthrough of DSL telephony. This is also reflected in the number of contracts at 1&1: While half a million DSL telephony numbers were activated in August 2005, this figure had already risen to more than one million by December.

1&1 enters the German DSL market. Four years later, 1&1 announces its entry into DSL telephony via Voice over IP at CeBIT 2004 and launches an innovation offensive. In addition, 1&1 concludes a DSL resale agreement for Bitstream Access with Deutsche Telekom. A few months later, 1&1 launches 1&1 DSL Plus, making DSL connections and DSL data traffic available from a single source at 1&1 for the first time.

The first 1&1 data center goes into operation in Karlsruhe.

In March 1998, 1&1 becomes the first Internet company to be listed on the Frankfurt Stock Exchange. The listed company 1&1 AG & CO. KGaA is renamed United Internet AG in 2000 and, as a holding company, forms the umbrella for 17 independent affiliated companies. Internet connections continue to be provided via the already established 1&1 brand.

The blue 1&1 cube becomes 1&1's distinctive brand image.

1&1 launches its own Internet access service, competing with T-Online for the first time.

In cooperation with the Federal Ministry of Posts and Telecommunications, 1&1 positions T-Online (then still BTX) as a universal and modern online service. Millions of PC users have their first online experience with 1&1 and T-Online becomes the largest online service in Europe.

1&1 enters teletext and ISDN marketing.

As it continues to develop its marketing services, 1&1's customers now include the German Federal Ministry of Posts and Telecommunications. Via teletext or ISDN connection, the PC becomes a universal terminal device. 1&1 also works for leading ICT companies such as IBM, Apple and Microsoft.

Ralph Dommermuth lays the foundation for today's 1&1 AG by founding 1&1 EDV-Marketing GmbH in Montabaur. In its early days, the company offers systematized marketing services to IT companies and software developers.