The major challenges that mobile devices such as the iPhone cause enterprises are in the areas of security, management, control, cost and heterogeneity. If IT organizations do not provide an appropriate security and management infrastructure, there is a risk that unapproved devices could compromise corporate information.
The adoption of such devices by employees tends to be in many instances user-driven as features such as ease-of-use, better screens, email, calendars, and contacts provide greater convenience, and can motivate the workforce to use the new device for corporate use.
Source: CBR Online, http://cbronline.com