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Currently they are running a promotion on their front page and also in store where they are offering a £40 discount on the Nokia Lumia 930 and £39.99 on the Lumia 735.
This brings the Windows Phone flagship down to £29.99 up front and only £23.50 per month, and the Lumia 735 to £0 up front and only £14.50 per month.
The offer ends on the 27th May 2015.
See the deals at O2 here.