> So you go a hour + without the ability to make phone calls or return texts?
Yes. Actually, that's most of my days too, as I rarely have a cellphone turned on, even when I'm at home. I've done my best to remove that from my life.
So that's also true when I leave home, except in super specific circumstances.
> Can you dial 911 on your laptop if an emergency happens while on the way to the coffee shop?
I think I might be able to, even if they don't guarantee service? TBH I don't care about that much: if an emergency happens to me, either I'll be unconscious and someone else will have to call 911 for me anyway, or I'll remain conscious and then I can decide what to do.
> Does the coffee shop not have Wi-Fi or do you not use public Wi-Fi?
Most of them do, but I don't like looking for the password/asking for it/fighting connectivity issues. It's too much of a hassle.
Instead, I type Win-A, click on "cellular" - and that's it: I'm online and everything works! Even if I only took my laptop and paid for a coffee! If offers a unique peace of mind: no distractions, no interruptions!
> How much is the additional data line for your laptop?
I don't remember the exact price, but quite cheap, about 20 a month. I mostly use it for ssh outside home.
> Is it just data or voice too?
It's just data, as voice requires some specific audio and call routing that's tricky. But if you use skype or google voice, you can do voicecalls.