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Is the module able to send short messages immediately after the power is turned on?
No. This is because the authentication with the SIM card takes some time after the module is powered on. Therefore, it is better to wait for 30s before you send short messages, or ERROR 512 will occur. CALL READY function is added in versions after build 10 of SIM300 series. Users can enable or disable this function through AT+CIURC. When it is enabled, users can only send short messages and make calls after the module is powered on and receive CALL READY.
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