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Hye sir,I been using gsm sim900a v3.8.2 .I do have problem with it. I can comunicate between gsm and Mcu . But the problem is. My gsm keep sending message to me. Sometimes it spam . So i change the CNMI command. It do chnge.. but it only read old message.. so do you know what suitable cnmi might be for sim900a to work properly.