It started with notebooks, but that wasn’t the master plan.
Any Linux phone is DOA for the foreseeable future because of the cellular radios.
You can get laptops that have 5G radios that you can use for data with Linux.
As I understand it, there’s no support for voice/SMSes at the radio level, but in theory, if you were willing to tolerate it and your cell service provider offers support, you could do WiFi calling.
Could also get service from a random other VoIP provider, use that over the data connection.
Probably not as battery-efficient, requires more of the stack to be awake to be listening for incoming calls.
I think that a larger downside is that Android software is designed for a touch screen and low power usage and low data usage across the board, and GNU/Linux software generally isn’t.
I imagine the lack of voice support presents some compliance issues with emergency calls.
Mmmm. I dunno. You’re talking about location availability off the hardware?
Last month, I had to call 911 when some random druggie lit what I thought was a building on fire across the street from my car (it turned out to just be a bonfire in the parking lot; figured that out while running over). I didn’t know the cross-street for my location, and asked the dispatcher if she could just send the fire department to the location she got from my cell phone via E911. She had no idea what I was talking about, needed me to manually provide location.
So I’m not totally sure, at least in the US, what the compliance requirements are for availability of location information.
If you’re talking about 911 usability without logging into a phone from a lock screen, I don’t think that that’d create any issues – that’s all software, can do whatever if you’re doing the OS.