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The iPhone and iPod are specific types of Personal Digital Assistant (PDA) that run the iPhone operating system. A PDA is a handheld, multifunction mobile device equipped with computing and information storage and retrieval competence.
Traditionally, PDAs were designed as an electronic personal organizer that stored addresses, appointments and task lists. Today, PDAs use wireless networks to access web content remotely; send/ receive email and some, like the iPhone, are known as Smart phones because they function as cellular phones.