For my travels, the phone battery has sufficient life and my routers’ USB 2.0 ports do not output enough to actually charge my phone, only to extend battery life somewhat. I also keep the USB 2.0 open for a flash drive or external wifi adapter. There are also powered USB to Ethernet adapters and also powered hubs with an Ethernet port.

I was able to get >600Mbps through Ethernet Tethering from my smartphone.