NC law currently bans use of text services on mobile phones while driving. The exceptions are for caller-ID displays on phones (no outright ban on cell phone use yet), GPS displays and dispatch systems. Is it reasonable to conclude that this ban applies to general text based communication devices built into the vehicle?

Given that automakers are failing to restrain themselves wrt GPS functionality and complexity (Google Earth -like capabilities are NOT appropriate for the driver to access) I would prefer removing the exception for GPS devices built into the car.

"§ 20-137.4A. Unlawful use of mobile telephone for text messaging or electronic mail.
(a) Offense. – It shall be unlawful for any person to operate a vehicle on a public street
or highway or public vehicular area while using a mobile telephone to:
(1) Manually enter multiple letters or text in the device as a means of
communicating with another person; or
(2) Read any electronic mail or text message transmitted to the device or stored
within the device, provided that this prohibition shall not apply to any name
or number stored in the device nor to any caller identification information.
(b) Exceptions. – The provisions of this section shall not apply to:
(1) The operator of a vehicle that is lawfully parked or stopped.
(2) Any of the following while in the performance of their official duties: a law
enforcement officer; a member of a fire department; or the operator of a
public or private ambulance.
(3) The use of factory-installed or aftermarket global positioning systems (GPS)
or wireless communications devices used to transmit or receive data as part
of a digital dispatch system.
(4) The use of voice operated technology