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If the device registers on the home network, it uses the GPRS
access settings of profile 0 for SIM1, and of profile 1 for SIM2.
Mode 2 (Operator Selection Enable ID=917 2)
In this mode, the device tries to register on the enabled network,
but for SIM1 networks with ID=0020-0039 are enabled, and for SIM2 –
ID=0040-0059.
When the power is on, the device selects profile 0, SIM1 and wait
for it to appear and be ready.
If the SIM-card is not detected or detected, but is not ready for a
particular timeout, the device checks if the profile switch (ID=0916)
option is enabled.
If the profile switch is disabled, the device puts the modem into
sleep for particular time. Once such timeout is reached the process is
repeated.
If the profile switch is enabled, the device switches to profile 1,
selects SIM2 and waits for it to be up and ready. If the SIM-card has not
been detected within a certain timeout, or it has been detected, but not
ready, the device switches to profile 0 and puts the modem to the sleep
for a particular timeout. Once such timeout is reached, the process is
repeated.
If SIM1 is selected, the list of networks enabled for it is checked. If
it is empty, the device tries to register on the home network of SIM1. If
the list is not empty, the device scans for available networks.
If networks are detected that are included to the list of enabled
ones, the device tries to register on one of the enabled networks. If the
device has failed to register on any of the enabled networks detected
using SIM1, or if there are no enabled networks in the list of available
networks, the device checks if the profile switch (ID=0916) option is
enabled.
If the profile switch is enabled, the device switches to profile 1 and
selects SIM2. The list of networks enabled for SIM2 is checked. If it is
empty, the device tries to register on the home network of SIM2.
If the list is not empty, the device scans for available networks. If
networks are detected that are included to the list of enabled ones, the
device tries to register on one of the enabled networks. If it has failed to
register on any of the enabled networks detected with SIM2 or no
enabled network has been detected in the list of available networks, the
device switches to profile 0 and switches the modem to the sleep mode
for a particular timeout. Once such timeout is reached, the process is
repeated.
If the device has managed to register on one of the enabled
networks, it uses the parameters of profile 0 for SIM1, and profile 1 for
SIM2, excluding GPRS connection parameters - APN/Usname/Uspass.
These parameters are unique for each operator and have their own IDs
for configuration.
If the device registers on the home network, it uses the GPRS
access settings of profile 0 for SIM1, and of profile 1 for SIM2.