I know people will vote this cold down to 24 month contract but you can sell the phone now and get around £200 or in a years time for about £100 and buy another and put sim in it.
£25 x 24 = £600
Quidco = £-45
Total = £565
free phone and no outlay other than first bill
Simplicity x 24 months = £480
w995 sim free = £350 at play.com (£300 on ebay if you dont want to use a retailer)
Quidco = -£100
Total = £730
Huge initial outlay
Here's the info
Tariff: O2 £25, Bonus 24 months
Inclusive minutes 600 minutes Anytime Any network
Inclusive texts Unlimited texts Anytime Any network
Usage rates (outside of inclusive minutes) - Usage rates Anytime
Anytime any network 12 p each
NOTE: I phoned up o2 as I'm at the end of a contract, mentioned this and also asked for unlimited web bolt on for free and they gave me it. So might be worth phoning o2 direct if at end of a contract and haggling and bargaining to get the web bolt on for free.
Quidco is at £45 but remember you wont get it if contacting o2 direct so the quidco is a benefit for new customers.
Cheaper deal would be appreciated if anyone knows of one.
Also have 14 day cooling off period.