Three (in the UK) offer unlimited for £24/mo.
Big mistake, $10/GB proved to be untenable. I hunted around a bit and found a service offered by Orange/Sosh: 25 euros per month got me 40GB of data and a pretty snappy 4G+ connection. Naturally I canceled my Fi plan immediately.
If anyone is willing to pay a reasonable fee for transfer of liability I am looking to switch to Google Fi with two lines for about $35/month + pay-as-you-use data.
On eBay there are all kids of "unlimited data" hotspots for $50 to start + $100/month; I don't know how these people can afford to do it. (Also ones for $5/month somehow but that's even harder to understand.)
Am I the only one who's really bothered when telecoms claim unlimited data then intentionally implement artificial limits on every aspect of that data?
(Also the companies are too big; with my local internet provider, a small company, I made a deal that if I pay 1 year in advance for the most expensive sub, they would ignore my usage. Fine with them.)