Virgin Mobile Essential Sim Only £17 (1200 mins, unlimited texts and unlimited data incl. tethering) for just £6.00/month (existing customers)
After being with Virgin for only 1 month on their Mobile SIM Only £12 plan (with unlimited data), I phoned up saying I wanted to leave for a cheaper contract with Three.
I then waited for quite some time while the CS assistant spoke to her supervisor before being told that I could have an £11 discount on their £17 plan.
I also have a student discount which should bring the price down to £5.10/month!
I even use this SIM in a mobile dongle to connect my laptop to the internet.
Phone: 0800 1839146