Although the differences on Network & Data aspect are not to important, now in this aspect (Display & Sound) we would find that this two master pieces really have important ones.

• First of all we have the size of the display. Both are 3.5 inches but the resolution on the Nokia N900 is up to a 800×600 pixels while in the iPhone you only have a 340×480 pixels. The display resolution of a display device typically refers to the number of distinct pixels in each dimension that can be displayed, so this would lead to a better definition of the images.
• Having many pros the N900 makes the iPhone 3Gs looks bad. But now it´s the iPhone 3Gs who wins with a dimension of 115.5 x 62.1 x 12.3 mm (a nice dimension considering that it´s a Smartphone) while the Nokia N900 dimensions are 110.9 x 59.8 x 18 mm (part of this due to the QWERTY keyboard).
• The dimensions bring another problem to the Nokia N900, the weight of 181 g against the only 131 g of the iPhone 3Gs. Again, due to a few more physical features.
• Finally the sound part, Nokia has got us used to have stereo speakers (3.5 mm) on their phones while the iPhone 3Gs has a single speaker (3.5 mm either).

Not only the good features have to be taken on account when choosing a phone (this makes it very attractive) but the size it´s important. Because you have to feel comfortable with it, when using it or while it´s on your pocket. So between this two you have to choose size or excellent features.