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SimCard Sim900 doesnt work once you take it our

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Rikr09

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SimCard Sim900 doesnt work once you take it out

Hello,

Im from Colombia and im having some troubles with the SIM900 Module. I designed a board with a microcontroller and the SIM900 module, all the system works excelent until some days ago when i discovered a problem wich is that:

i insert the MOVISTAR simcard and turn on the board and it registered correctly, then i turn off it and remove the simcard and turn in on the card again wothout the Sim; obviously it doesnt have to register, i try some AT-commands and the module responds normally, theres no problem yet. Now i turn it off, insert again the SimCard and turn it on the board, and i dont know why now the Sim DOESNT REGISTER :sad: ... anymore ! I have to remove it, insert another one, wait until it register and then reinsert the firs one.

These are the messages wich i received from the module:

Code:
Firts time with the Simcard:
Setting...

+CFUN: 1

+CPIN: READY

+CGREG: 0

Call Ready

+CGREG: 1

Without SimCard:
Setting...

RDY

+CPIN: NOT INSERTED

+CFUN: 1

+CGREG: 0

Here is when it doesnt register:
Setting...

+CFUN: 1

+CPIN: READY

+CGREG: 0

Call Ready

I never had made this, so i didnt be attent to this problem, i dont know what to do.

So , please i need your help.
Thanks!
 
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