A smartphone is worth buying because it’s a device that lets you make telephone calls, but also adds features that you might find on a personal digital assistant or a computer. A smartphone also offers the ability to send and receive e-mail and edit Office documents, for example.

While there is no standard definition of the term “smartphone” across the industry, there are a few features that you’ll find on every smartphone.

Here’s a list:

Operating System: A smartphone will be based on an operating system that allows it to run productivity applications, such as the BlackBerry OS, the Palm OS, or Windows Mobile.

Software: A smartphone will offer more than just an address book. It may allow you to create and edit Microsoft Office documents or manage your finances.

Web Access: A smartphones offer some sort of access to the Internet. You can use your smartphone to browse your favorite Web sites.

QWERTY Keyboard: A smartphone includes a QWERTY keyboard, so the keys are laid out in the same manner they would be on your computer keyboard.

Messaging: All cell phones can send and receive text messages, but what sets a smartphone apart is its ability to send and receive e-mail. Some smartphones can support multiple e-mail accounts. Others include access to the popular instant messaging services, like AOL’s AIM and Yahoo!