In the UK....
n97mini on tmoile 24 months @�15 + �5 internet + initial cost �110 +8GB sd(class4) �25 =�615 for two years with internet.
iphone 3gs 16gb vodaphone 24 months@�35 + initial �88 = �928
So like for like comparison in the UK is stupid because iphone costs over 50% more.
If you stip away the data costs (which is difficult as these are more of a sellers market)...say �15 per month then the equipment cost comparison becomes a joke....
N95mini = �255
iphone 3GS 16GB = 568
Thats a whopping 122% more to own the 16GB iphone.
The mini will become expandable to 40GB soon with 32GB micro sd(rumoured to be on its way)