My phone recently received a text message that read, "Finder has detected SIM change." The phone has not left my possession. It is a Samsung Galaxy Note 5 with Android 7 software. It has F-Secure FREEDOME, SAFE, and Safe Browser on it.
Should I be concerned? Should I block that text message/number?
I don't know the answer myself, as I don't use the mobile app, but there is a related topic here, which may provide you with a clue:
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