Nokia X3-02 Touch and type mobile for £69.95 when purchased along with £10 top-up. Available on vodafone, T-mobile, Orange and Virgin networks for this price. But on O2 the phone costs £79.95 plus £10 top-up.
Excellent phone with 3G, Wi-fi and touch screen along with normal keypad.
This is the cheapest price I have found for this phone. Can be available as an upgrade as well.
I believe that the phone is available in only two colours : Dark Metal and White silver.
Most importantly the phone is unlocked. and quidco cashback - £6.50 :)