sim card registration prior to use with SIM900 GSM module

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shekhar.shakti@masamb.com

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Hello,
I have a SIM900 module by simcon.
It works with few sim and doesn't work with maximum sim (including roaming sim)
Please help me with a solution asap.

Thanks
Shekhar shakti
 

It means the problem lies with the sim card not with the SIM900 module..
 

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