Define a test plan that lists which services must stay online and what would count as a successful failover. Do a controlled failover by disconnecting the primary WAN and observe whether critical apps remain reachable, VPN paths stay secure, and remote management remains accessible via the mobile link. Check the backup SIM is active, has data, and uses the correct APN. If you use any external antennas, verify their viability during the test. Document results, assign ownership and schedule regular tests so the team knows what to expect in a real outage.
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What should I test first to validate cellular backup works in practice?
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