4. Do you want more storage space?

Although the iPhone will support video, it has the storage capacity of the iPod Nano. That amount of space is limiting for many people in terms of the amount of songs that it can hold. Consider how cramped that space will be if you want to store and watch video on your iPhone. Most iTunes Store movies are more than 1GB each, and TV episodes can range from 100MB to 300MB. One season of a TV show could come close to filling a 4GB iPhone by itself. If you want video (or a large number of songs or photos) on the go, you're likely to find a video iPod to be a much better choice.

5. Are you an entry-level phone user?

The iPhone has many slick features, including its multitouch interface, orientation sensors that switch the display based on how you hold it, and a complement of visually stunning applications. However, if you typically opt for an entry-level or more basic phone, you may find that you won't use all of those features. Even if you typically use a slightly more expensive phone, consider how much you'll use the advanced features of the iPhone. If you honestly think you won't use them that often, you may want to consider whether they're worth the cost.

6. Do you need more features or applications on your phone?