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Template:FMB640 Dual SIM (view source)
Revision as of 13:06, 2 December 2020
, 13:06, 2 December 2020no edit summary
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==Introduction to Dual SIM Functionality==
==Introduction to Dual SIM Functionality==
{{{model|FMB640}}} is able to operate in DUAL SIM switching mode to minimize the bill accounts for
[[{{{model|FMB640}}}]] is able to operate in DUAL SIM switching mode to minimize the bill accounts for
GSM/GPRS services.
GSM/GPRS services.
card using it must be placed in the SIM1 slot for FMB640 to switch minimum times. (SIM1 SLOT is closer to PCB, SIM2 SLOT
card using it must be placed in the SIM1 slot for FMB640 to switch minimum times. (SIM1 SLOT is closer to PCB, SIM2 SLOT
is the upper one).
is the upper one).
If a SIM card is inserted into SIM 2 slot and 1 SIM operator list mode is used, FMB640 will
If a SIM card is inserted into SIM 2 slot and 1 SIM operator list mode is used, [[FMB640]] will
work normally, but there will be more switching activities. In addition, APN settings in GPRS
work normally, but there will be more switching activities. In addition, APN settings in GPRS
should be entered for SIM 1 and SIM 2 to avoid not sending records over GPRS.
should be entered for SIM 1 and SIM 2 to avoid not sending records over GPRS.
[[File:dual.png]]
[[File:dual.png]]
==Dual SIM algorithm==
Two SIM cards use algorithm is shown in the diagram below:
Two SIM cards use algorithm is shown in the diagram below :
[[File:algo.png]]
[[File:algo.png]]
==Home Network==
[[{{{model|FMB640}}}]] gets possible operator codes list from the network and compares them with the operator codes
{{{model|FMB640}}} gets possible operator codes list from the network and compares them with the operator codes
inserted in the Home profile’s list. At first, it tries to connect to SIM 1 Home Operator, if the operator is
inserted in the Home profile’s list. At first, it tries to connect to SIM 1 Home Operator, if the operator is
unreachable; the device switches to the SIM 2 slot and tries to connect to the SIM 2 Home Operator.
unreachable; the device switches to the SIM 2 slot and tries to connect to the SIM 2 Home Operator.
