Using Google Voice with a ported phone number allows a cell phone to be hardwired via Ethernet for calls and texts, even when the phone itself is on airplane mode.

“if you use Google Voice or these other apps you can make a call through the internet based services and you don't actually need to have Wi-Fi on at all”

“so with my cell phone I had Google Voice an app put on there and I ported my phone into Google Voice so that way when I'm at my desk or in my house I can hardwire my phone just like we do with a laptop and then I can still receive texts and calls”