QCM v QMI protocol

What is the main difference between QCM and QMI protocols? Which one should I use for a 4g router

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QMI is a standard protocol that various modem use.

QCM is for quectel modems. Supposed to be better compatible with Quectel modem but I have no more info.

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Has anyone figured out what exactly it's for?

For me, it was always set to QMI. It worked everywhere. Now, in Belgium, it only works if I set it to 3G; otherwise, the router doesn't connect to the mobile network.

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Interesting, because I just had the same experience when moving a router from the UK to Greece but I have no idea why this would be the case.

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