Just got my new glmt300n-v2. My phone hotspot is turned on, my phone is connected to the router via USB. When I go to the tethering tab I get the message that no phone is found. I have a Samsung S9. Help, please!
I googled and get this https://www.samsung.com/au/support/mobile-devices/how-do-i-setup-usb-tethering/
by the way, GL-MT300N-V2 already have v3.x firmware with more convenient UI, https://dl.gl-inet.com/firmware/mt300n-v2/v1/
I had a similar issue with my 750S slate router and a Nexus 5x. If I used a Anker USB3 type C data cable the router did not see my phone.
However using a non USB C certified cable (USB2 only) my phone was detected and USB tethering worked.
Strangely the tethering function does not work with any of my quality USB3 type C cables ! (Perhaps dure to the inclusion of tie-up resistors in the type 3 cables ?)
Hope this helps,