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Roaming options
The tracking device "BI-520L TREK" is able to operate in two modes: in
the home network mode and in the operating mode with a predetermined list
of authorized operators. Operation mode is set with ID 0917 parameter.
In the home network mode (ID 0917 = 0), the device makes attempts
to register in a home network of installed SIM-card. List of authorized
operators is not used.
Operating with a predetermined list of operators (ID 0917 = 1), the
device checks the list of approved operators.
If the list is empty, the device acts like in a mode of operation in a home
network.
If the list is not empty, the device scans for available networks. If there
are any networks, included in the list of authorized ones, the device makes an
attempt to register in one of the authorized networks. After successful
registration, the device will be connected to the selected network until it is
available. At the loss of network signal the process will be repeated. If the
device does not detect the allowed networks enabled in the list, or it is not
able to register within the network, it will go to sleep mode within a certain
timeout, after which the process will be repeated.
