Dial-A-Phone are currently offering the HTC Desire Z on an O2 tariff. Free phone and £20.42 monthly for 18 months. Works out at £367 total. This is cheaper than buying SIM Free.
Contract gives 100 mins and unlimited texts but no data so no good to use with the handset. Look on it as an interest free loan or give the SIM to a relative to use and diary to cancel at month 17.
And at the moment Quidco are offering £65 cashback on HTC Desire/Desire Z connections with Dial-A-Phone.
Rodman has posted that you can downgrade the tariff after 9 months. Cheapest O2 tariff on an 18 month contract is £15.32. So potentially you would pay:
9 Months @ £20.42 = £183.78
9 Months @ £15.32 = £137.88
Less £65 Quidco makes a total of £256.66
Dial-A-Phone handsets always seem to be sim free. You get 7 days to return it if it turned out not to be the case.
anhf has just got his/her handset and confirms it is UNLOCKED/SIM FREE :)
Total cost if you don't change the tariff after 9 months works out at £367, £302 if Quidco pays out.