I am expecting to get blasted for this, but here we go....
This deal only works if you take quidco into account, they have just increased cashback to £150 for contracts.
This deal takes a bit of hunting for, YOU MUST SELECT THE PHONE PLAN FIRST (12 month contracts require a few clicks), if you select the phone first you have no option of a 12 month contract.
You then select the Dolphin plan @ 27.41p/m, the phone then costs £146.5. This plan gives you 200 mins and 300 texts, there are other plans to choose from as well.
However quido tracks @ £150, so the phone then becomes free. I placed my orer about 1 hour ago and it has tracked the full amount already.
Total Term Cost = (12 x 27.41 + 1 x 146.5) - 150 = 325.42
I choose to add the 500mb of data for 4.89 p/m. This was the cheapest deal I could find, and I have been looking hard! Hope it helps somebody.