CHEAPEST EVER, rebranded ZTE Crescent/Orange San Francisco II, with huge developers' support, easy to unlock. I paid 99 for mine and my wife is happy with it... Quidco paid after 3 months (£20 on that occasion).
Quidco is £10 not £20 (for PAYG Handsets worth £20-£59.99)
-To haq - I received £20 when paid £99 in Jan 12 :)
Quidco is £20 not £10 (it shouldn't be, technically haq is right, but £20 tracked on mine!)
Quidco could track at £20 but could change to £10 when your not looking.
My advice: Don't hold your breath.
unlock guide with screenshots . See comment #183, pg4 (#post15152403) -gk
As of August Quidco / TCB now tracking @ £10