Just ordered this deal.
This is a cashback deal but the cost is only £20 / month before cash back
Contract is for 24 months. 18 months 1/2 price.
Also a possible quidco of £50 bringing this down to an effective cost of £10.42 which for this phone and this number of minutes is a good deal.
for tarriff details
Quidco tracked for me straight away at £50