In practice, verify the backup SIM status in the router’s management interface: look for an active cellular data session, solid signal, and the correct APN. Confirm the backup SIM has data available and is not expired, and check any carrier indicators the device exposes. If you use external antennas, re-check their connection and ensure they’re usable during a failover. Treat SIM status as a test checkpoint and include these verifications in your test results so SIM issues are caught before an outage.
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How do I verify the backup SIM stays active between tests?
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