I would use 8bits and PDU mode to send SMS , but when I set "AT+CSMP =x,x,x,y",y=25 ,0,4,240~243. The GPRS module responses error code: 303. How can I deal with it?
The "AT+CSMP=x,x,x,y" command applies only to the SMS TEXT mode, it does not apply to the PDU MODE. In PDU mode all the SMS parameters are enclosed in the PDU.Therefore you don’t have to send the AT+CSMP command if you work in PDU mode.
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