That depends on the router’s failover rules and on how failure is detected. Some systems swap because the mobile connection drops outright. Others watch whether traffic can still reach a known destination, which is often more useful because a link can stay technically connected while being practically unusable. The transition may be quick, but the real question is whether the application can tolerate a short interruption while the router re-registers and re-establishes sessions.
Comset can help tune that behaviour for the job. An unattended monitor, an EFTPOS terminal and a site-to-site VPN tunnel may each need slightly different failover logic.
Public Q&A
How quickly can a dual-SIM router move to the second SIM if the first network fails?
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