Choose two carriers that provide real coverage diversity at your site. Look for networks with strong signal at the installation location and, ideally, different core networks. Consider practical differences that affect uptime: carrier plans, APN options, roaming rules, data caps, and how each SIM is billed. Also decide whether you want automatic failover or a manual switch, and ensure the router and management platform can enforce that policy. Plan a hands-on test: verify both SIMs register and pass traffic, measure latency and throughput in typical loading, and test failover behavior with realistic outages to confirm it meets uptime requirements.
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How should I pick two carriers for dual-SIM redundancy?
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