This is certainly the case with smartphones and PDAs (personal digital assistant). Smart devices include items such as mobile phones, smartphones, PDAs and even PDA phones. To confuse matters further, the term smartphone is different from Smartphone, which refers specifically to a family of Microsoft mobile devices. A smartphone can be a Smartphone but not all Smartphones are smartphones. Oy vey!
Let us break it down to the basics. A mobile phone, or cellular phone, is any device that provides wireless voice communication. A mobile phone may also provide an Internet connection that allows for web browsing and e-mail. It may also include technologies such as Short Message Service (SMS) and Multimedia Message Service (MMS). Much beyond that and it is probably not, or at least more than, a mobile phone.
A PDA is a device that combines many of the most common computer functions with telephone and fax service. These devices have personal organizer software built-in and include advanced networking and Internet capabilities. Companies focus their PDA products on being highly portable, highly functional computers that include voice communication.