Connection mobile 4G modem on ISR 4331 for the USB port is possible

[clmoura]

Good afternoon all

I would like to know if it is possible to use a Mobile 4G modem as a backup of my main link,
on the ISR4331 router. For connection USB PORT

[Leo Laohoo]

Not possible. 
Not supported.

[pieterh]

in addition to Leo's post
it may be an option not to use a usb-modem, but a small 4G-to-LAN router and configure the 4331 for dual-WAN connection