Welcome to Koscom Customer Center!

Koscom constantly offers more convenient IT solutions and prompt services as the world’s leading IT company

Voice of Customer

Any advice is always welcome!

Call us at

If you have any inquiry on authorized certificate,
please call us at

  • Press 1

    for certificate management

  • Press 2

    for security token

  • Press 3

    for electronic tax invoice

  • Press 0

    to directly talk to a counselor

Business Hours
  • From Monday to Friday: 08:00 to 19:00
    On Saturdays: 09:00 to 13:00
  • Closed on Sundays and public holidays
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