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I'm trying to send a SMS using AT commands and after typing the cellphone number it show the CMS: ERROR 302.

What I'm doing:

AT

OK

AT+CMGF=1

OK

AT+CMGS="<3 digit local area code><7 digit cellphone number>"<Enter>

+CMS: ERROR 302

I've found this post: AT+CMGS returns ERROR but couldn't find a solution. Am I typing something wrong? I've changed SMS-encoding to GMS as the post describes.

Community
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Hazael Estrella
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2 Answers2

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Try this:

AT

AT+CMGF=1

AT+CSCA="sms tel. service",145

AT+CMGS="tel. number"
text message here
^Z

Some modems need set CSCA (SMS Service Center Address) always.

And look here for a examples and descriptions.

ZZerog
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I found out that sending exactly the same AT commands by hand worked, but sending them from a controller did not (with waiting for the correct answers). Getting the 302 error. But then doing all commands a lot slower with waits of 2 secs in between it suddenly started to work. Apparantly the SIM900 needs more time after it answers, or something.

user16458212
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