Apple's iPhone is a popular type of smartphone that makes calls, serves as a music and video player, and hosts a variety of applications --- or "Apps" --- that the user can download from an online store. The third-generation iPhone, which was sold between 2007 and 2010, came in 8-gigabyte (often written as 8 GB or just 8G) and 16-gigabyte models. There are only a few differences between these models.
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The major difference between the 8-GB iPhone and the 16-GB version is its data capacity. The number of gigabytes describes how much data the flash memory drive can hold; the 16-GB model holds twice as much as the 8-GB version. This is especially important if the iPhone is used to store and play movies; a single movie can take up between 500 megabytes and 1 gigabyte of space, meaning that the 8-GB model could potentially hold only seven movies (with some space allocated to software and phone contacts).
The third-generation iPhone has a plastic case that's available in two colours: white or black. The choice, however, was only offered for the 16-GB model. All 8-GB iPhones are black. Third-party cases can be used to surround the iPhone with another colour, but these cases add weight and bulk to the phone.
iPhone 3 and iPhone 4
While the last iPhone to come in both 8-GB and 16-GB sizes was the iPhone 3, the iPhone 4 (released in 2010) has a 16-GB model. There are many differences between the 16-GB iPhone 4 and the 8-GB iPhone 3, as the iPhone was completely redesigned between models. Beyond having double the storage space, the 16-GB iPhone 4 also offers a metal and glass case instead of the iPhone 3's plastic. It has two video cameras (one on each side) and a higher quality display. It is slightly heavier and larger than the iPhone 3 and offers about 25 per cent more battery life in most applications.
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