Consider how much more common this would be if wireless ISPs added more reasonable options for adding additional devices to your plan. More devices which would eat through your crazy low transfer cap more quickly...which they currently charge you quite a bit to tack on.

I honestly don't have much interest as things stand. I'm on a theoretically unlimited AT&T plan for my phone. I might pay a few extra bucks to get other devices onto cellular. But, for the fees as they exist today, I'll just make do with my phone if WiFi isn't available.

I'm almost surely​being inadvertently obtuse, but how in the heck is it legal to restrict my use of the service I pay for. Is there a case law reference easily pointed out?

Indeed. I've often wondered why my Macbook Pro can't just have this option. I would use it fairly infrequently but when I did it would be so damm handy.

I bought a new Thinkpad last fall and it has a slot for a SIM card. What I don't know is where on earth I can get a good cellular internet plan I can use with this! Just something for occasional light use (emergency SSH sessions, etc).

I would pop a Ting SIM card in.

https://ting.com

Sprint / T-mobile network, so not as good coverage, but $6 a month and just pay for what you use for data.

Excellent customer service, too. I'm probably going to another provider soon, since I've been using my cell plan heavily enough for a while now to make Ting not wholly economical - but I'm probably going to keep the account active and the SIM in my satchel, just because it's worth $6 a month to have the option if I need it.

Awesome, hadn't heard of this. Very responsive customer service. Thanks for the reference. Just placed an order for a SIM card. Hope it works with Linux! :)

If you ever come to the UK, Three offers plans that have free roaming in about 60 countries including the US. Works with PAYG too.

I'll go one step further — any pro tablet, and any $1000+ device, should have it builtin.

It doesn't add much cost. You can get an entire smartphone with LTE for less than $100. So maybe the LTE costs $20.