README.md: SIM must not perform IMSI detach
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@ -89,6 +89,11 @@ it overwrites the IMSI with the next pseudo IMSI and invalidates the TMSI and
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Kc. The applet triggers a refresh, which causes the SIM to do a new Location
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Update with the new IMSI.
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It is important, that the SIM does not invoke the IMSI detach procedure (TS
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04.08 Section 4.3.4). This is controlled by the network. Otherwise it becomes
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trivial to correlate the detach of the old IMSI with the attach or Location
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Update of the new IMSI.
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## Notes
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### What if the SMS gets lost?
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