[General] Sms problem in sim300

[v.s.n.kumar]

Hi,
i have interfaced the sim300 to hyper terminal. i made a call to other number & i got the call also. i received the sms. i read the all sms at once by using AT+CMGL="ALL" , but if i want to read a single sms by using AT+CMGL=1, 4 or 5 then i get the error as +cms error: 305. for writing a sms also i get the same error. so plsease can any body tell me the solution

 

[jayanth.devarayanadurga]

AT+CMGR=x to read message at x and AT+CMGW=x to write message to storage at location x.