A standard Swedish telephone plug carries one telephone line and has four flat metal pins and one plastic pin.
 The design is only used in Sweden and older installations in Iceland (RJ11 and a data/voice standard using an 8P8C modular connector are used in more recent buildings).
 Neither plug nor socket is compatible with other plugs and sockets.
 It is defined in Swedish Standard SS 455 15 50.
The Danish telephone plug is the special flat round telephone plug used in Denmark for POTS (analog) telephone lines and some "raw copper" (for ADSL etc.) telephone lines.
 The plug has 3 flat pins arranged at right angles to each other.
 This plug is used in few if any other places in the world, and most equipment now made uses the US/International RJ11 socket on the device end and includes either a cable with the Danish Telephone Plug at the wall end, or a standard RJ11 to RJ11 cable with a bundled Telephone Adapter .
F-010 or T plug or PTT plug is a type of telephone plug and matching socket.
 The F-010 standard originated in France and is used there (overseas departments and territories included) and in other countries, including Algeria, Andorra, Bhutan, Burkina Faso, Chad, Comoros, Republic of the Congo, Djibouti, Egypt, Equatorial Guinea, Gabon, Grenadines, Ivory Coast, Madagascar, Mali, Mauritania, Mauritius, Monaco, Morocco, Niger, Rwanda, Senegal, Somalia, Togo and Tunisia.
TDO ("Telefonsteckdose") is the telephone plug used by A1 Telekom Austria.
A standard tetrapolar telephone plug has four round metal pins and one plastic pin.
 The design is only used in Belgium for telephone wiring.
 It is similar to the tripolar telephone plug of Italy and also the Swedish telephone plug.
The telefonic tripolar plug is the first type of telephone plug used in Italy.
 It has also been used in Turkey in older installations.
A telephone plug is a type of connector used to connect a telephone set to the telephone wiring inside a building, establishing a connection to a telephone network.
 It is inserted into its counterpart, a telephone jack, commonly affixed to a wall or baseboard.
 The standard for telephone plugs varies from country to country, though the RJ11 modular connector has become by far the most common.
The Protea telephone plug, sometimes called simply the "South African" telephone plug, was widely used in South Africa from the 1970s until the 1990s.
 As of 2004, telephone installations in South Africa use RJ11 plugs (which are sometimes referred to in South Africa as "Venus" plugs), but Protea plugs are still often encountered in older installations.
The Telebrás plug is the old Brazilian telephone plug and socket system.
 It uses a large plug (about 4 cm x 4 cm) with 2 flat metal pins + 2 flat plastic pins.
 Three of the pins have the same orientation and the fourth pin being rotated 90 degrees to make it impossible to plug in the wrong orientation.
A1 Telekom Austria (A) is a major Austrian fixed and mobile network operator.
 It has been operating commercially since 1994 and in testing since 1992.
 It launched under the name Mobilkom Austria.
 After the merger with Telekom Austria in July 2010 it operates under the new name of A1 Telekom Austria.

Question: What telephone plug is used by the company which launched under the name Mobilkom Austria?
Answer: TDO