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m900a missing the network

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mohammad.habibi

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hello
when I use sim900a in my project after 1 day sim900a missing the network and do not receiving the sms, I tried to solved this problem with at+creg at command
when I turn sim900a it show +creg: 0,1 and I check this at command any 10 min but sim900 after 1 day do not receive sms ,,,
which at command need to check for making the sim900a safe?
thanks a lot
 

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