The Sony Ericsson S500i slider phone is available from phones4U for £1.99 per month for 12 months on a 12 month contract.
That works out £23.88 for the full term. Plus if you go through Quidco you could get £50 cashback giving you a profit of £26.12. You also get 3 months free insurance (£5,99 a month after the first 3 months but you can cancel anytime) . You can also select free itemised billing during the order process.
This is a cashback offer so not for those of you that are not organised or worried about cashback compliance. I did read the smallprint and phones4u allow 60days from the bill date to claim which is twice as much as any previous cashback I have taken out.