Some lawyers still prefer the BlackBerry for its keyboard and longer battery life. But the iPhone's big screen, slick interface and easy-to-use touchpad makes it an enticing device. The touchscreen makes it a snap to switch between browser windows and zoom in and out of documents.

Steven Wegman, an attorney at Greenblum and Bernstein in Washington D.C. has not abandoned his BlackBerry for an iPhone yet, but believes it's a good tool for lawyers.

"You can open to review all PDF and Word files and Excel spreadsheets, and shortly that will allow you to edit these files on the iPhone," he told The Industry Standard.

Another lawyer, Amber Taylor, tries to have the best of both worlds.

Taylor, an associate with Weil Gotshal in Washington D.C. carries a BlackBerry and an iPhone. Each serves its own purpose, she said. She relies on her BlackBerry to access her work e-mail, which runs on LotusNotes and is not supported by the iPhone. She uses the iPhone to browse sites such as LexisNexis and check personal e-mail.