If I was to sell a brand new black iPhone 4S, what is the best price to sell it for?

It was never used, still has the film on it.

Probably around £350 to £250

20k to 25k is better price to sell.

Cell/mobile phones have their own category. HINT: It's under the consumer electonics tab.

Cell phone questions do not belong in the cars & transportation section.

What does this have to do with the buying & selling of cars?