Dulaney suggested that in the future, Apple should create processes for managing the iPhone as Microsoft Corp. and Research in Motion Ltd. did for Windows Mobile and BlackBerry devices, respectively.

Dulaney also urged IT managers to warn users who might sign up for a two-year commitment to the product to assess several factors -- including how much they travel internationally, since international roaming rates for data usage could be high. Data-roaming costs have become an issue for at least one major global manufacturer who found that because the iPhone makes browsing and data usage so easy, travelers can incur thousands of dollars in data costs on a single trip.

Another concern is battery life, Dulaney said. In Gartner's testing using default settings on the iPhone 3G, the battery "seldom experienced a full day of use," he said. That happened while using Exchange ActiveSync, some limited browsing and no telephone calls, he said. The drain on the battery may be caused by using the iPhone in a Wi-Fi network, or it might be Apple's implementation of ActiveSync that requires more power to stay constantly connected to the network to deliver new mail.

Also, users might like to know that the iPhone does not support the ability to edit attachments in email and that attachments take time to download, he said. And he noted that e-mail users can't cut and paste details from an e-mail into an appointment application. "The quickest way to do this on the iPhone today is to write the details down on a piece of paper and re-enter them," Dulaney wrote.