Deutsche Telekom in the context of "Postal, telegraph and telephone service"

Big business involves large-scale corporate-controlled financial or business activities. As a term, it describes activities that run from "huge transactions" to the more general "doing big things". In corporate jargon, the concept is commonly known as enterprise, or activities involving enterprise customers.

The concept first rose in a symbolic sense after 1880 in connection with the combination movement that began in American business at that time. Some examples of American corporations that fall into the category of "big business" as of 2015 are ExxonMobil, Walmart, Google, Microsoft, Apple, General Electric, General Motors, JPMorgan Chase, Bank of America, Wells Fargo, Citigroup, and Goldman Sachs; in the United States, big businesses in general are sometimes collectively pejoratively called "corporate America". The largest German corporations as of 2012 included Daimler AG, Deutsche Telekom, Siemens, and Deutsche Bank. SAP is Germany's largest software company. Among the largest companies in the United Kingdom as of 2012 are HSBC, Barclays, WPP plc, and BP. The latter half of the 19th century saw more technological advances and corporate growth in additional sectors, such as petroleum, machinery, chemicals, and electrical equipment (see Second Industrial Revolution).

Hrvatski Telekom, also known as HT or Telekom, is a Croatian telecommunications company founded in 1998. Headquartered in Zagreb, it is majority-owned by Deutsche Telekom with a 53.5% stake and is publicly traded on the Zagreb Stock Exchange.

The Deutsche Bundespost (German pronunciation: [ˌdɔʏtʃə ˈbʊndəsˌpɔst], lit. 'German Federal Post') was a German state-run postal service and telecommunications business founded in 1947. It was initially the second largest federal employer during its time. After staff reductions in the 1980s, the staff was reduced to roughly 543,200 employees in 1985. The corporation was dissolved in 1995 under two rounds of postal reforms that took place in the German Post Office in 1989 and 1995, respectively. Following the reforms, the former Deutsche Bundespost was broken into three publicly traded corporations: Deutsche Post AG (postal services), Deutsche Telekom (telecommunications), and Deutsche Postbank AG (banking).

T-Mobile is the brand name used by some of the mobile communications subsidiaries of the German telecommunications company Deutsche Telekom AG in the Czech Republic (T-Mobile Czech Republic), Poland (T-Mobile Polska) and the United States (T-Mobile US).

The T-Mobile brand was introduced in 1996 and the name was previously used by subsidiaries in other countries, including Austria (now Magenta), Croatia (now Hrvatski Telekom), Germany (now Deutsche Telekom), Hungary (now Magyar Telekom), Montenegro (now Crnogorski Telekom), the Netherlands (now Odido), North Macedonia (now Makedonski Telekom), Slovakia (now Slovak Telekom), and the United Kingdom (now EE).