My deal is a £33/month line rental contract for 18 months, but I get 6 months half price line rental.
200 minutes, 100 texts, and a free Moto v3.
Plus, it was through OAFC, so they get something out of it, and I get £20 for every friend I refer.
Finally, I sold my old phone from my old contract for £90 on eBay, so I figure it's a pretty good deal.
Think the way they make money out of it is locking you into their insurance policy, but at £5.99 a month, with 3 months free, it's not too bad.
I reckon cost is £33 (line rental) + £6 (insurance) = £39 * 18 = £702
Discounts are £16.50 * 6 (1/2 price line rental) + £6 * 3 (free insurance) = £117
Free stuff = PSP £180
So, approx £400 for 18 months, and at the end I can sell the phone again. I'm happy enough with that, especially as work will pay for all the calls I make