ThePhoneSpot (part of Carphone Warehouse) is offering O2 SIM only deal for 12 months FREE (12 month contract). Go via Quidco for £50 cashback, which is a Profit !
Offer available on O2 200 min + 250 txt tariff which gives 200 x-net anytime minutes & 250 texts / month. Please note this deal does NOT include handset but cashback is VERY RELIABLE.
This deal works by redemption meaning, the line rental (£30) is paid in advance to the network every month and equivalent line rental for the whole year is claimed back from ThePhoneSpot (claims handled by e2save).