NEC MOBILEPRO 900 - Manual (Page 41)

Getting Started 1-33
Using Other Communication Devices
During synchronization via USB or serial port, the PC Connect cable
must be connected to your host PC. However, if you are using the
serial PC Connect cable, you must disconnect the serial cable before
using the internal modem, IR port, or a network card in your
MobilePro.
Connecting Remotely
In addition to using your MobilePro as a companion PC, when you
travel you can connect by modem directly to an Internet service
provider or a network remote access server, to get e-mail and to view
web pages.
See Chapter 5, “Setting Up a Remote Connection” for details.