It looks like MVNO The People's Operator have updated their sim-only deals, and so we've got a couple to highlight for you. The first is mentioned above, and comes on a rolling 30-day contract allowing you to quit at any time. However, if you want to get a bit more for your money, TPO are still offering their £14.99 monthly contract (with the first 2 months at under £4) which gives you unlimited texts, unlimited minutes, and 6GB of data a month. For reference, TPO operate over the EE network, and while they currently do not support 4G they are aiming to bring the high-speed mobile connection to their service at some point this summer. Thanks to kar20ol @ HUKD!