Hello.

I've been using the Archer VR900 for a few months. I know it offers the option of using a 4G USB dongle as a backup option in case the line connection fails. My question is: if it switches to the dongle, will the router still send a wifi signal or does a 4G dongle only work for devices that are connected via ethernet? 

Otherwise I'm thinking of buying an Archer MR600 standalone 4G router, but of course that's a more expensive backup option.

Thanks for your help.