Messaging and e-mail : Text messages send text only, and multimedia messages send pictures and videos as well as text. Some handsets support instant messaging from services such as AOL and Yahoo. If you'd like to receive personal or work e-mail on your handset, make sure it supports this feature. Messaging and e-mail does cost extra, however, so consider purchasing a data plan if you'll be using the features frequently. You might also consider a phone with an alphabetic keyboard for faster typing.

Camera and video recorder : Use them for taking pictures and shooting brief video clips. Some have a low-grade VGA resolution, but many camera phones now have resolutions of a few megapixels or more, which offer much better photo quality. Similarly, while some camera phones offer just a few extra features, other models offer a flash and editing options that resemble those on a regular camera.

Speakerphone/conference calling : A speakerphone is useful for hands-free calling when you're driving or multitasking. Consider getting a unit with a full-duplex speakerphone, which allows both parties to speak at the same time. Business travelers who need to set up impromptu meetings will want to look at a phone that supports conference calling.

Push to talk : A walkie-talkie-like service that lets you immediately connect with individuals or call groups, which is especially useful for business users who need instant contact with their colleagues. Best of all, you don't need a cell signal to use them and you won't use standard calling minutes. Not all carriers offer this feature, however, and it's not available on all phones.

Bluetooth : This feature lets you wirelessly connect via low-frequency radio waves with external devices, such as a headset for making calls. Many phones also allow you to use Bluetooth to exchange or sync data with other Bluetooth devices or to connect to stereo headphones to listen to music. For more information see CNET's Quick guide to Bluetooth.

Multimedia options and memory : Some features to look for include a digital music player, support for MP3 files, and an FM radio. Also, many phones now support streaming video through 3G wireless broadband networks, live TV, and wireless music downloads. Check out the carrier reviews for AT&T, Sprint Nextel, and Verizon Wireless for a complete list. There will be an extra fee, of course, and you'll need 3G service in your area.

For the best experience with a multimedia phone, make sure your phone has plenty of storage space (an external memory card slot is best), and consider whether you want dedicated music controls on the exterior of the phone

Accessories, applications, and personalization options : Some phones come in multiple colors or allow for changeable faceplates. Accessories such as Bluetooth headsets, speakers, or SIM card readers also are available, but make sure it's specifically designed for your phone of choice. Most models offer a variety of customization options as well. These can include a choice of display wallpaper, screen savers, and ring tones. If personalizing your phone is important to you, make sure you have a lot of options before buying a particular model.