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Message: <blockquote data-quote="laal" data-source="post: 8732895" data-attributes="member: 94459">How Do SIM Card Works on Mobile Phones CircuitA 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 memorySIM 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 voltageThe other one is not connected<a href="http://3.bp.blogspot.com/_8JZhVVmpICU/S-2QQot8M_I/AAAAAAAAAWY/R_ZtIm_6qTw/s1600/SIM+CARD+block+diagram.jpg" target="_blank"><img src="http://3.bp.blogspot.com/_8JZhVVmpICU/S-2QQot8M_I/AAAAAAAAAWY/R_ZtIm_6qTw/s400/SIM+CARD+block+diagram.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a>A Typical block Diagram above shows on how SIM Circuit Works on a Cellular phones circuits.In the layout the <a href="http://cellphonerepairtutorials.blogspot.com/2010/05/how-to-identify-spare-parts-and-how-it.html" target="_blank">Sim Interface Connector</a>  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.<a href="http://3.bp.blogspot.com/_8JZhVVmpICU/S-2YEm87p_I/AAAAAAAAAWc/OQhsKc5e5nM/s1600/sim+card+schematic+diagram+1.jpg" target="_blank"><img src="http://3.bp.blogspot.com/_8JZhVVmpICU/S-2YEm87p_I/AAAAAAAAAWc/OQhsKc5e5nM/s400/sim+card+schematic+diagram+1.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a> 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.<a href="http://3.bp.blogspot.com/_8JZhVVmpICU/S-2cU6mQTPI/AAAAAAAAAWg/6v-Fa_7bf-0/s1600/sim+card+schematic+diagram+2.jpg" target="_blank"><img src="http://3.bp.blogspot.com/_8JZhVVmpICU/S-2cU6mQTPI/AAAAAAAAAWg/6v-Fa_7bf-0/s400/sim+card+schematic+diagram+2.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a>The picture below is an equivalent layout of  an EMI filter and its internal circuitry,only both frequency and data lines is being filtered.<a href="http://3.bp.blogspot.com/_8JZhVVmpICU/S-2dzi1K_DI/AAAAAAAAAWs/wZjnVxI4WYY/s1600/SIM+electromagnetic+interference+ic.jpg" target="_blank"><img src="http://3.bp.blogspot.com/_8JZhVVmpICU/S-2dzi1K_DI/AAAAAAAAAWs/wZjnVxI4WYY/s400/SIM+electromagnetic+interference+ic.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a>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.<a href="http://4.bp.blogspot.com/_8JZhVVmpICU/S-2dsMOZmNI/AAAAAAAAAWo/fiP9IxiiT7I/s1600/sim+card+connection+layout+with+emi+ic.jpg" target="_blank"><img src="http://4.bp.blogspot.com/_8JZhVVmpICU/S-2dsMOZmNI/AAAAAAAAAWo/fiP9IxiiT7I/s400/sim+card+connection+layout+with+emi+ic.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a>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 component connections.<a href="http://1.bp.blogspot.com/_8JZhVVmpICU/S-7HdOt7-MI/AAAAAAAAAXA/9aUwuM6ZM0w/s1600/sim+tracing+line.jpg" target="_blank"><img src="http://1.bp.blogspot.com/_8JZhVVmpICU/S-7HdOt7-MI/AAAAAAAAAXA/9aUwuM6ZM0w/s400/sim+tracing+line.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a> <a href="http://3.bp.blogspot.com/_8JZhVVmpICU/S-2iiILju2I/AAAAAAAAAWw/EVj14FvV5XA/s1600/sim+ic+jumper+solution+guide.jpg" target="_blank"><img src="http://3.bp.blogspot.com/_8JZhVVmpICU/S-2iiILju2I/AAAAAAAAAWw/EVj14FvV5XA/s400/sim+ic+jumper+solution+guide.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a>A  picture above is an alternative way by many mobile phone technician  dealing with SIM problem issues on most Nokia Mobile Phones.</blockquote>

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