The USB data cable allows you to connect your Iridium Extreme® phone to a laptop in order to provide a data connection for email or web access. Software and installation instructions are provided on your included CD-ROM or can be obtained from your service provider. The USB Data Cable plugs directly into the mini-USB connector on the left side of your Accessory Adapter. Make sure your Accessory Adapter is connected to your phone, the USB cable is attached to your laptop, and software is installed for use. Airtime charges apply for data service usage.