Digi WAN 3G User Manual page 104

Mobile Carrier Settings
Mobile carrier selection allows the mobile device to be configured to use a specific mobile service
only. The recommended and normal operation is for the mobile device to automatically find
service with an available carrier. However, a manual selection can be configured to force the use of
a particular carrier. Please be aware that use of a manual carrier selection can result in a
significantly longer time interval for the unit to find service on the specified network. Both the
mobile network and the mobile device (modem) may influence this behavior. Therefore it is
recommended that the Automatic selection be used wherever possible.
Warning: The scan for available carriers requires that the mobile PPP connection be terminated to
perform the scan. A successful scan cannot be performed and completed if it is initiated over the
mobile connection, since the scan procedure requires user interaction that is not possible after the
mobile PPP connection has been terminated.
 Automatic: Enables automatic selection of a carrier for the mobile service connection.
The mobile PPP connection is not automatically restarted if automatic carrier selection
is configured.
Manual: Enables manual selection of the Network ID of a carrier for the mobile service

connection. The carrier selection is the concatenation of the Mobile Country Code
(MCC) and Mobile Network Code (MNC) value for a carrier. The MCC is always a
three-digit decimal value, and the MNC is either a two- or three-digit decimal value. A
properly entered Network ID is composed of five or six decimal digits, with no other
characters in that value.
The Scan available carriers... link initiates a wizard that instructs the modem to scan
for available carriers and display a list from which the desired carrier may be selected.
The scan may take as little as 20 seconds or up to two minutes to complete. Scanning for
carriers requires that the mobile PPP connection be terminated so the scan may be
performed. Upon completion of the wizard, the mobile PPP connection is restarted
using the selected carrier.
Note: If the Mobile Band Settings selection in use by the modem is other than Automatic, the list
of carriers returned by the scan may include only a subset of the carriers available in the area.
The Network ID from a carrier selection from the list may be manually entered. However, the
mobile PPP connection is not automatically restarted if the manual entry method is used.
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