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| + | __TOC__ |
| + | |
| ==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. |
| | | |
− | SIM1 card has higher priority than SIM2. For one SIM | + | SIM1 card has a higher priority than SIM2. For one SIM |
− | card using it must be placed in 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 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. |
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| [[File:dual.png]] | | [[File:dual.png]] |
| | | |
− | | + | ==Dual SIM algorithm== |
− | | + | Two SIM cards use algorithm is shown in the diagram below: |
− | * '''Dual SIM algorithm'''
| |
− | 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 |
− | * '''Home Network'''
| + | 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. |
− | {{{model|FMB640}}} gets possible operator codes list from the network and compares them with the operator codes | |
− | inserted in Home profile’s list. At first, it tries to connect to SIM 1 Home Operator, if operator is | |
− | unreachable; the device switches to SIM 2 slot and tries to connect to SIM 2 Home Operator. | |
| When the connection procedure is successful, FMB640 stays connected to the available | | When the connection procedure is successful, FMB640 stays connected to the available |
− | Home operator using the SIM card, which was inserted for and works according to the Home
| + | home operator using the SIM card, which was inserted for and works according to the Home |
| profile parameter settings. | | profile parameter settings. |
| If none of the Home operators could be connected with, FMB640 switches to the SIM 1 | | If none of the Home operators could be connected with, FMB640 switches to the SIM 1 |
| card tries to connect to its roaming operators from SIM 1 Roaming profile. | | card tries to connect to its roaming operators from SIM 1 Roaming profile. |