i think you have some problem in code to sent the command from microcontroller. So, try the following code to sent from microcontroller
AT+CMGF=1,0DH,0AH (where 0DH and 0AH both used for special character (enter))
i think this will help you, if it will not solve your problem then sent me your code.
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i think you have some problem in code to sent the command from microcontroller. So, try the following code to sent from microcontroller
AT+CMGF=1,0DH,0AH (where 0DH and 0AH both used for special character (enter))
i think this will help you, if it will not solve your problem then sent me your code.