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__TOC__
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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
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[[{{{model|FMB640}}}]] is able to operate in DUAL SIM switching mode to minimize the bill accounts for
 
GSM/GPRS services.
 
GSM/GPRS services.
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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
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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.
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[[File:dual.png]]
 
[[File:dual.png]]
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==Dual SIM algorithm==
 
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Two SIM cards use algorithm is shown in the diagram below:
* '''Dual SIM algorithm'''
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Two SIM cards use algorithm is shown in the diagram below :
      
[[File:algo.png]]
 
[[File:algo.png]]
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==Home Network==
 
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[[{{{model|FMB640}}}]] gets possible operator codes list from the network and compares them with the operator codes
* '''Home Network'''
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{{{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.