USSD Call Back

USSD Callback is a VPMN-independent solution that enables low-cost voice calls for postpaid and prepaid subscribers.  The solution can be activated for all roaming party networks or only on selected networks.

The USSD Callback solution is available in two variations; Conventional USSD Callback – Subscriber sends a USSD string which includes the dialed number (B-Number) or Seamless USSD Callback – a Java-based applet which is installed on the SIM card.  Both solutions can be implemented over INAP or SIP.


  • Lower roaming rates – based on MT calls
  • Does not need VPMN’s approval to reduce rates
  • Incentive for roamers to make more calls


  • Instantly increases roaming potential to all roaming partners
    • Immediate Prepaid roaming creates new revenue streams
    • Complements Operator’s existing CAMEL agreements
  • Seamless user-experience results in increased ARPU
    • No need to remember USSD codes