The Apple iPhone 3GS 16GB is exactly the same as the Apple iPhone 3GS 32GB except that it has half the memory, i.e. 16GB as opposed to 32GB. Many users find the $100 price difference for that amount of memory to be a little steep but, since there's no expansion slot, those who need the whopping 32GB of memory don't have an alternative. Check out or complete review of the Apple iPhone 3GS 32GB for other details about this great smartphone.