This Samsung Galaxy S II deal at Affordable Mobiles is usually £30.64PM, but £95 redemption brings it down to £25.36PM. That works out at £456.48 over the 18 months.
You get a monthly T-Mobile allowance of 600 minutes, 500 texts and unlimited data.
We gots a Samsung Galaxy S II specs page right here.
(Thanks to Jinkz at HUKD)