@Alex, my guess is that there might be some hastily configured "Call-Cost notification system" involved.Probably, after making a call, the system triggers a USSD message to your handset while using a different encoding format from the one your handset understands - hence the message does not display on your handset. As a result, your handset is technically in an active USSD session that is later torn down after the session limit lapses.I bet that if you can reboot your phone quick enough when experiencing this, then the USSD service will be accessible almost immediately.Tony.
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