Among the features you find on Apple's iPhone -- but not the majority of other mobile devices -- is the phone's dedicated hard drive, which stores up to 32 GB of information, depending on which version you own. As a result, the iPhone neither needs nor accommodates an auxiliary memory card.
Mobile Memory Cards
As mobile technology has advanced to allow for the greater use of multimedia such as music, photos and videos on cell phones, so too has the need for storage. As many mobile phones -- other than smart phones which include not only the iPhone, but also BlackBerry and Android-powered devices -- function with neither a sophisticated operating system nor a hard drive, many of them now accommodate "microSD" memory cards, small versions of the SD memory cards popular in digital cameras.
iPhone Hard Drives
Upon its initial launch in mid-2007, the iPhone was available only with 8 GB of hard drive space, which increased to an optional 16GB with the introduction of the iPhone 3G the following June. The highest capacity version of Apple's iPhone 4, launched in July 2010, can accommodate up to 32 GB of data. Whichever iPhone variant you own, your device has more storage space than the majority of memory cards designed for use with mobile devices. In fact, the iPhone can't even accommodate a memory card.
One slot on the iPhone you may confuse for a memory card read is its Subscriber Identity Module or "SIM" port, located on the top of the iPhone. The only function this port has is accommodating the iPhone's SIM card, which allows it to be used on your carrier's network. Optionally, you can copy your list of contacts from the iPhone's hard drive to a SIM card, but the card's information storage capabilities end there.
Another feature unique to the iPhone is iTunes backup. Whenever you sync your iPhone with iTunes, the program creates a backup file which contains all the data that existed on your iPhone at the time of the sync. As a result, your iPhone's data is stored not only on its hard drive, but also on your computer, providing insurance in the case of an iPhone hard drive failure, or if you need to restore your iPhone to its factory settings.
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