http://www.mobileshop.com/mobile-phones/o2/pay-monthly/motorola-v220.php/PNEWO2V2200003
You get the phone free, pay £25 per month line rental and claim it back in two chunks at six and then twelve month. 100 free minutes and 100 free texts a month (double that for the first three months). Just remember to put the cash backs in, cancel the free insurance after three months and cancel the contract after 12 months and you`ll have a free mobile for a year. :D