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Mode 3 (Operator Selection Enable ID=917 3)
In this mode, the device tries to register on the home network for
SIM1 or one of the enabled networks set by the entire list of enabled
networks ID=0020-0059.
When the power is on, the device selects profile 0, SIM1 and waits
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 device tries to register on the home
network of SIM1. If the device has failed to register on the home network
with SIM1, the device checks if the profile switch (ID=0916) option is
enabled, and if it is, then 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.
Configuring Roaming Settings
The configuration is given based on the example of dual-SIM device
operation: on the home network and roaming.
Nation GSM carrier SIM-card is inserted to slot for SIM1 and
roaming card goes to SIM2.
Profile switch is enabled:
setparam 0916 1;