vodafone do 12 month tariffs in store only -- 50 x12 equals 600 and the phone is free :-)

this includes -- 900mins -- 500mb net -- unlimited sms -- voda passport

so you pay roughly 100-150 for your phone allowance for the year

has to be one of the best options around if you ask me

means your getting all the tariff for around 10 a month :-)