T-Mobile UK just announced the plan to kill all plans for our brothers and sisters across the pond. It's called The Full Monty and it's everything that you could possibly want in a mobile plan - unlimited calls, texts, data, and tethering all for one price.
The plan has four different variants, each of which is mostly differentiated by applicable devices. Here's a quick overview of what it looks like:
If you notice, the most affordable plan is also the one available on the widest variety of devices, but it also has one hindrance compared to the other choices: it only offers 2,000 talk-time minutes to networks other than T-Mo.