iPhone 5 will be announced within a few hours, so here's the weigh-in on what to expect versus what's already out there. iPhone 4 was hugely popular, still sells and costs a bundle. But with the iPhone 5 launch, some of the iPhone 4 features won't seem as appealing because they will have been upgraded. A faster smartphone with more memory will always be just around the corner, and dual core and even quad-core phones are soon to be the norm. Those are good reasons to upgrade. Start the slideshow to see the top 10 reasons to upgrade to Apple's newest iPhone.

iPhone 4

iOS 5

iPhone 4

A4 Microprocessor

iPhone 4

iPhone 4

Steve Jobs

iPhone taking a photo

4. Increased Memory

Corresponding to speeding up its processor, the iPhone 5 must accordingly increase its storage capacity. The constantly growing app store and new features surfacing every other day have increased the demand for more storage in random memory. Many Android phones, such as the Galaxy S2, have already increased their storage to 1GB RAM.

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