e2save have a cracking deal on this clearance handset. Connect to O2 on a 12 month contract. The handset costs 99p and you claim the 12 months line rental back in 4 stages, plus an automatic cash back after 2 months. Quidco also pay £36.50 for contract phones
There are few cashback deals around now and this is from one of the bigger players. Stick to the cashback terms to ensure you get your line rental cashback. Been with them a couple of years on cashback deals and always had my money.