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hi please help me what is different of AT commands simm300 to 900. please help me. here my program is workin good in sim300 but this is not working for sim900.
SIMCOM has a document describing the SIM300 versus SIM900 AT command differences. In any case I would ask which command fails in what way? To answer the question, you'll need to capture the modem communication with a suitable tool like docklight.
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