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Multiple GSM sims connection with modem

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Hi Every 1.........! Can any one tell me that how i can connect different GSM sims with a single modem in such a way that previous sim maintain its status i.e missed call, received calls etc.....? Infact i want multiplexing
Kindly reply me as soon as possible
 

Hi

I have never done this before although i have lot of experience using GSM modem

I think you can use an analog multiplexer (like CD4053) and a slow clock source (1-2 sec) from your controller to switch the multiplexer signal from one SIM to another
and stop the clock signal when you detect an incoming call

Otherwise you will need a dual SIM support modem



All the best

Bobi
 

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