User`s guide

Configuration through the web interface
115
Update PRL settings
Note These settings apply to Digi cellular-enabled products that use the Sierra Wireless
MC57xx series CDMA/EVDO modules.
The Update PRL page is for loading a preferred roaming list (PRL) into the cellular module on the
Digi device. A PRL is a database that resides in a mobile device that contains information used
during the system selection and acquisition process.
It is built by the mobile service provider,
and is normally not accessible to users.The PRL indicates which bands, sub bands and
service provider identifiers will be scanned and in what priority order. Without a PRL, a mobile
device may not be able to roam, or obtain service outside of the home area. There may be cases
where missing or corrupt PRL's can lead to 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
mobile device 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.
To load a PRL, fill in values for these settings:
 PRL File: The location and name of the PRL file to be loaded into the cellular module.
Enter the PRL file’s pathname or click the Browse button and use the browse dialog to
select the file.
 MSL/OTSL: The master subsidy lock (MSL) or a one-time subsidy lock (OTSL)
associated with the module. This value is a six-digit activation or unlock code supplied
by the mobile service provider.
Click the Upload button to upload the PRL file to the cellular module.
If the PRL loading/updating operation was successful, the status message PRL update successful is
displayed in a blue box above the settings.
If an error occurs, a red box with a message describing the error is displayed above the settings.
PRL updates can also be done over the air
by dialing the over-the-air (OTA) feature code
*228.