Microcontroller › 8051 › GSM SIM 300 interfacing › i tried to send sms using
November 8, 2013 at 4:44 pm #10588
i tried to send sms using sim300 and hyperterminal from my pc.
i type AT then enter and i got ok meaning the modem is good next,
AT+CMGS=234 phone number
+cms error: 321
what have i done wrong please advice