Kyocera QCP 6035 Reference Manual page 194

You can use Data/Fax mode with the flip open or closed. Notice, however, that you
cannot make or receive voice calls or use any other applications while the phone
modem is in use. Incoming phone calls will receive a busy signal or go directly to
voicemail. Opening any other application terminates the modem call.
You can still receive calls while the phone is idle and the Data/Fax application is on
the screen; just not while the modem is in use.
1. Slide the phone into the cradle. If the cradle is attached to the port you use for
HotSync operations, turn off HotSync on your computer.
If you are using a data cable and/or a different port than the one you use for
HotSync operations, it is not necessary to turn off HotSync.
2. Tap to view the Applications Launcher.
3. Tap to open Data/Fax mode.
You see status information beginning with "Initializing Modem" and
continuing to "Ready to Send Data or Faxes."
4. From the computer, make the connection you want to initiate.
Tap the Applications Launcher and select a different application or close the flip and
press the End key. The session terminates automatically.
When Data/Fax mode is running, you see "Modem
InUse." You cannot receive voice calls or open other
applications while Data/Fax mode is running.