Quote:
Originally Posted by LBarouf
Do you know to which networks the IMSIs are tied to? How do you control on the SIM which IMSI to send to the VPLMN and how can each IMSIs be used by the same MSISDN. Wouldn't the HLR return an error? I thought 1 MSISDN=1 IMSI. Unless each MVNO agreement is tied to a different HLR but CDRs are consolidated per MSISDN for billing.
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Once long ago I read the details of how multi-IMSI SIMs work. I've forgotten the details. However, I know that at some point the phone tells the SIM the MNN of the network it is attempting to register on. The multi-IMSI SIM can change its personality based on this information. There is really no way for the user to get the SIM to change its behavior. It all has to do with the networks the phone sees when trying to register.