Not all of them work, some specific models did. https://documentation.meraki.com/MX/Cellular/3G%2F%2F4G_Cellular_Failover_with_USB_Modems#Compatible_USB_Modems Also note: USB Modems Deprecated for All MX and Z Series Devices Starting in firmware release MX19.1 support for USB based 3G, 4G LTE modems will be deprecated on MX and Z platforms. Any modems connected to the USB port on an MX or a Z series platform may not work. If you wish to continue using currently supported USB modems please roll back to MX18.2
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