Whom do you think Apple feels the main competitor of iPhone. As per present scenario it is Motorola, Nokia, Sony Ericsson etc. I feel it must be between Motorola in the US and Nokia in other parts of the world.
From everything that I have read and seen about the iPhone it seems that motorola and Apple are in on the iPhone together so if anything their competition will be their partner.
This will only be known after the product is launched. Products from Nokia have a great demand in the market, so it is to be seen how iPhone takes on Nokia products.
I never cared for Nokia. I don't think there is going to be much competition from them unless they have something similar in the works. I am starting to believe their main competitor is going to Microsoft.