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sim 900 error ,+CMS ERROR: PS busy

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anny 23

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hi
I am using sim900 module. I was successfully send sms. after one month I am again trying to send send sms using same module but I am getting an error which as follows:
+CMS ERROR: PS busy

I also tried different sim cards but result is same. Plz. help me to solve this problem Its very urgent
:-(
 

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