Upside: The 7510 promises to pack a lot into one package. A phone, a Web browser (through Nextel Online's wireless Web), e-mail access, and an organizer are all included, and the addition of the speakerphone is a welcome plus over Nextel's previous 6510 model. Its other features are largely the same as those of the 7210 and the 7230: a 65,000-color, 240x160-pixel display; a QWERTY keyboard; and a thumb-operated trackwheel, as well as support for Java and real-time e-mail with attachments.
Downside: Though the 7510 has 16MB of flash memory and 2MB of SRAM, it lacks a memory expansion slot. Also, this model works on Nextel's 800MHz iDEN network in the United States only and not abroad.
Outlook: The 7510 looks like a good match for Nextel's business-oriented users who want--and can afford--to make the switch to a sophisticated smart phone. However, its ultimate success will depend on a sub-$350 price point.