They are both the same thing. Cellular phones are Mobile phones.
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A PDA stands for Personal Digital Assistant. Mobile phones or cell phones are simply devices which enable a user to call, text, or view web content. PDA devices have more features which enable the user to use computing, telephone, fax services, and personal organizer services.
Although pre-paid phones aren't as common amongst Americans, there isn't that much difference between the quality of the phones. The one thing that is different is that usually companies that offer contracts will offer extra perks and apps.
cell phones
the iPhone is more technical than other phones
Only those who know the difference between 'sell' and 'cell' !
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Personal Digital Assistants are typically computing and internet browsing devices used with styluses, usually for work reasons, while cell phones are any device that offer calling, and usually texting services.
Analog and digital signals can both be transmitted wirelessly. Wireless internet (Wi-Fi), for instance, uses digital. AM and FM Radio uses analog. Cell phones are digital. Cordless phones can be digital or analog.
cell phones
The simple answer is that smartphones are more intelligent, like they have WiFi, apps, edge/3G, often a touchscreen (and/or slide out keyboard). And cell phones are just for phoning, txt messaging and maby a camera.