CalAmp SMC-CDMA Series, User Manual

Page: 39 / 62

001-0004-819 Rev01
Page 39 of 62
PRL and PRI Commands
The Preferred Roaming List (PRL) is a database residing in a wireless (primarily CDMA) device, such
as a cellphone, that contains information used during the system selection and acquisition process.
In the case of RUIM-based CDMA devices, the PRL resides on the RUIM. The PRL indicates which
bands, sub bands and service provider identifiers will be scanned and in what priority order. Without
a PRL, the device may not be able to roam, i.e. obtain service outside of the home area. There may
be cases where missing or corrupt PRL's can lead to a customer not having service at all.
On many networks, regularly updating the PRL is advised if the subscriber uses the device outside
the home area frequently, particularly if they do so in multiple different areas. This allows the phone
to choose the best roaming carriers, particularly "roaming partners" with whom the home carrier has
a cost-saving roaming agreement, rather than using non-affiliated carriers. PRL files can also be
used to identify home networks along with roaming partners, thus making the PRL an actual list that
determines the total coverage of the subscriber, both home and roaming coverage.
The PRL is built by an operator and is normally not accessible to the user. Many operators provide
the ability for the user to download the latest PRL to their device by dialing the Over-the-air (OTA)
feature code *228.
Table 10.10: PRL & PRI Commands
Commands Description
AT+CPRL1 This command set/get the PRL header parameters.
AT+CPRL2 This command enables the user to control the PRL acquisition table.
AT+CPRL3 This command enables the user to control the PRL System table.
AT+MPRISUM This command returns the PRI checksum.
Enhanced AT Commands (Carrier Specific)
Table 10.11: Enhanced AT Commands
Commands Description
AT$SPMDN This command reads the 10 digits phone number.
AT$SPMSID This command reads the 10 digits phone number.
AT$SPFWREV This command reads the current Firmware version.
AT$SPMIPERR This command retrieves the last MIP error from the device.
AT$SPSPC
This command unlocks the SPC code, to enable access to protected
areas of the device.
AT$SPPRL This command reads the current PRL number from the device.
AT$SPSERVICE
This command reads the service to which the modem will attempt
to connect.
AT$SPSIGDBM This command reads the current Receive Signal Strength Indicator.
AT$SPCURRENTLOCK This command reads the current device lock code.
AT$SPROAM This command selects the Roaming Preferences.
AT$SPERI This command reports the current enhanced roaming indicator.
AT$SPRMGUARD This command enables/disables the roam guard unsolicited report.
AT$SPLOCATION This command enables/disables the GPS service.
AT$SPGETLOCATION This command returns the device current location.
AT$SPNMEA This command enables or disables the NMEA stream.
AT$SPRESET This command reset the module (power off than power on).