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[inquisitor]

Of course when you enter a toggle country without a local IMSI the STK application would need to switch back to the Roaming IMSI in order to automaticaly request and receive a local IMSI. The Roaming IMSI in turn would be restricted to USSD while all calls remain blocked (should be easy to implement with CAMEL). Actually an automatic STK-based IMSI selection process is already in use today.