Case in point: Three has some stupidly cheap SIM only deals on the go, which are perfect for those where money is tight. Grab 8GB of data for just £8/month with Three's SIM Only deal right now ...
Currently, the cheapest unlimited Sim available costs £9.69 with iD Mobile. You'd need to weigh up if you actually need unlimited data. In our most recent data usage poll, only 8% of our users ...