How Do SIM Card Works on Mobile Phones Circuit

A SIM Card also known as Subscriber Identity Module, A SIM is a Smart Card that can store data from a cellular phone. Those data like identity, location and phone number, network authorization data, personal security keys, contact lists and stored text messages. Security features include authentication and encryption to protect data and prevent eavesdropping.

But how does this SIM card works within the mobile phones circuit? How does mobile phones reads and write data unto it?
In those particular questions above, If we learn answers unto it, we can solve problem issues regarding SIM related problems, like Insert Sim Card and etc.

Now here's a brief explanation on how does SIM Circuit Works on a mobile phones circuit.

A Sim Card have six pads that also corresponds to the six SIM connectors pins, but only five has totally have connection on the entire layout.
SIM DATA - this is a digital data that being stored on a SIM memory
SIM Clock - this is a clock frequency signal that being synchronize to the digital data to create data signal in order transfer or sends and receive data information.
SIM Reset - this is also a frequency signal that triggers or reset all synchronization process.
VSIM B+ Supply Voltage- This a power supply voltage used to activated the SIM circuit.
SIM Ground - a ground line voltage
The other one is not connected

A Typical block Diagram above shows on how SIM Circuit Works on a Cellular phones circuits.
In the layout the Sim Interface Connector connected directly to SIM Control Circuit. The SIM Control Circuit is the one the generates Clock frequency that triggers the SIM data storage, once the SIM is now being  triggered, it is then now sends data information to the application processor to  begin the process with. The application processor is the one that gathered  all data information from the SIM memory, initiate and activate it, if all information is in desired status.
Those three particular lines of signal flows associated in the circuit shows how the synchronization is being applied. If one of those lines being cut off the sending and receiving process will breakdown, and  will result to SIM problem issues. The Power Supply Voltage through the SIM is also remain stable otherwise a lack of voltage will not activate the SIM to work.

In a picture below an EMI-ESD Filter has been added to protect  the circuit to an Electro-static Discharge and Electro-magnetic Interference disorders. This type of SIM connection circuit is an advantage to mobile phone technician for troubleshooting SIM related problem issues. Thus, type of particular EMI filter is very vulnerable  and mostly create breakdown to the entire SIM connection.

The picture below is an equivalent layout of  an EMI filter and its internal circuitry,
only both frequency and data lines is being filtered.

The EMI Filter is a tiny chips designed to protect  SIM DATA, SIM Clock and SIM Reset data  signals that flow across trough the SIM connector.

 The EMI-ESD Filter is a highly integrated device designed to suppress EMI(Electromagnetic Interference) and RFI(Radio frequency Interference in a circuit. This filter includes ESD protection circuitry which prevents damaging the mobile phone application when subject to ESD ( ElectroStatic Discharge) surges up to 15 kV.

Here's an example of how the the SIM data signal  flow across the printed circuit board.Note: this is only shows where the signal flows from component to componentconnections.

 

 A picture above is an alternative way by many mobile phone technician dealing with SIM problem issues on most Nokia Mobile Phones.

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Flash mtk with usb only, no box ,no solder rx tx

1. mito 277 mtk6252 , for boot press * readback start address 0x00000000 length 0x00800000
2. mito 355 mtk6252, for boot press green button readback start address 0x00000000 length 0x00800000
3. mito 318 mtk6252, for boot press top right corner readback start address 0x00000000 length 0x00800000
4. mito 611 mtk6253 , for boot press top right corner readback start address 0x00000000 length 0x01000000
5. mito 833 touch mtk 6253 , for boot press lower right corner/end call button readback start address 0x00000000 length 0x01000000
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8. buat visio v999 (touchscreen) for boot press middle button at navigation
9. nexian g522 mtk 6225 for boot press Q button readback start address 0x00000000 length 0x01000000
10. SPC jazzone .. mtk 6253 for boot press green button
11. nexian g900 mtk6225 for boot press Q button readback start address 0x00000000 length 0x02000000
12. mito 588 mtk 6252 boot for boot press lower right corner readback start address 0x00000000 length 0x00800000
13. ht g33 mtk6235b nand flash for boot press Q button / * readback start address 0x00000000 length 0x04000000
14. beyond b111 mtk 6252 for boot press lower right corner atas readback start address 0x00000000 length 0x00800000
15. mito 312 mtk6252, for boot press lower right corner atas readback start address 0x00000000 length 0x00800000
16. nexian g911 mtk6225 for boot press Q button readback start address 0x00000000 length 0x02000000
17. ht a15 mtk6252 , for boot press * button readback start address 0x00000000 length 0x00800000
18. gvoon330 mtk6252 for boot press call button & 1 readback start address 0x00000000 length 0x00800000
19. nexian g722 mtk6225. for boot press Q button readback start address 0x00000000 length 0x02000000
20.nexiAn tap 868 for boot press call button.
21.nexian g801 xl,MTK 6235,for boot press space button
22.Nokia X8-00 MTK6253, boot mode vol -
23.mito 255 mtk6252 tombol for boot press * button or # readback start address 0x00000000 length 0x00800000
24.mito 388 mtk6252 tombol for boot press * button or # readback start address 0x00000000 length 0x00800000
25.nexian g912 mtk 6225 for boot press Q button readback start address 0x00000000 length 0x02000000
26.nexian g922 mtk 6225 for boot press Q button readback start address 0x00000000 length 0x02000000
27. nokia n900 china mtk 6225 for boot press enter button
28 nexian g923 mtk6225 for boot press Q button
29.mito 311 mtk6253 for boot press back/near left power on/off readback start address 0x00000000 length 0x01000000
30.gvon 111 mtk6252 for boot upper right button
31.pixcom model pg20 mtk6253 for boot upper right button
32.taxco m8 mtk6252 for boot upper left button readback start address 0x00000000 length 0x00400000
33.ht mobile a25 mtk6253 for boot upper right button readback start address 0x00000000 length 0x01000000 its only for MTK Chipset not another Chipset CPU any kinds the topic is just for MTK remember that?

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Sfr 344 unlock 100% and pinout

Sfr 344 unlock 100% and pinout
InfinityBox Mmodule 4.05
unlock method: smart fast
PINOUT attached

""LOG FILE
COM3 [VCP1] selected
module v4.05
Action: "sp-unlock"
unlock method: smart fast
Model: SFR-344
Checking data, wait...
Phone should be Switched OFF !
Press and HOLD Power button now !
19200 autodetect
Initializing [6253:8A02:8A00]...
CPU: MT6253
high speed boot On
chip: 0000:0000:000F
status: FF
Connecting at 19200, wait...
Release Power button now !
Phone detected, wait...
Hardware: MT6253,E02
Date: 2000.00.00
Version: 1.0
Version: X730_V2_Z1_FRES_B20F108
Version: MB5307AV1BMB_BV1.0
115 byte(s) read
imei: 86440800013380
connection Ok
216 byte(s) read
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reading data #2...
building new data...
writing data...
204 byte(s) read
reading data...
264 byte(s) read
building new data...
writing data...
verifying...
verification Ok
done
Finished, time used: 13 sec
Remove/Install battery now !""

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NOKIA N8.00,RM-596,(Symbian Belle)V111.030.0609 (Arabic , Urdu and English) Language's with ini's

NOKIA N8.00,RM-596,(Symbian Belle)V111.030.0609 (Arabic , Urdu and English) Language's with ini's

177 mb

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how to hard reset the Samsung Galaxy TAB GT-P1000

Here's the instructions on how to hard reset the Samsung Galaxy TAB GT-P1000. Please do have a back-up copy all of the important documents stored on the device, it will be all deleted including any 3rd-party applications installed on it.

Resetting the device through Home Screen, this may hrlp to fix if the phone experience some hangs up or freezing if opening some applications.
Samsung Galaxy TAB GT-P1000 Hard Reset
To reset the phone:
1. Select Settings
2. Select Privacy
3. Select Factory Data Reset
4. Then select Reset Tablet

If the Samsung Galaxy TAB GT-P1000 is frozen or unresponsive, you can do hard reset through button key combination.

To hard reset:
1. Turn the  Samsung Galaxy TAB GT-P1000 Power OFF
2. Press and Hold the Volume Down and Briefly press the Power button.
3.Release the Power button button when the Samasung logo appears.
4. An additional menu will appear, just follow the whole instruction to hard reset the device.

The device will then reboot, after this process been done and back to its original factory default settings.

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