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USSD - Unstructured Supplementary Service Data

The USSD (Unstructured Supplementary Service Data) mechanism allows the MS (Mobile Station) user and a PLMN (Public Land Mobile Network) operator defined application to communicate in a way which is transparent to the MS and to intermediate network entities. An example of a USSD string is *#136#numbers#


  • Fully interactive 3GPP based network map
  • Narrated call flows
  • Detailed network procedures

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