You can plug an Ethernet cable into an Android phone with a USB-C Ethernet adapter, and then click "Ethernet tether" in your phone. Then connect the phone to the server rack to keep the servers online during an outage.
Can it do the reverse?
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I'll let you know when I get my internet back.
Another hurricane?
I'll answer for you. Yes. you can 100% disable mobile & WiFi and then use a wired Ethernet connection to connect an Android device to the internet.