How to buy a smartphone

They're smaller, more user-friendly, and more addictive than ever. Fortune's guide for those who don't get a company freebie.

Palm Treo 750 ($550) from Cingular. (Sprint and Verizon also offer 3G Treos)
Smartphones come in two basic designs: Most common is the "candy bar" (pictured). Good for one-handed use. The other has a slide-out keyboard - bigger screen but more bulk. Good for images and anything that requires lots of typing.

Screen: Standard is 2.5 inches; 2.25 inches will do. Slide-outs can top three inches. Touchscreen is nice but not crucial.

Keyboard: All smartphones use a QWERTY layout, but all are not created equal. The devil is in the size, placement and texture of the keys. There's no substitute for picking up some phones and trying them out.
Hardware Operating system Wireless network Key questions Should I get...
The smallest, the fastest and the best phone for a power user. (more)