Modem GSM: Poll SMS doesn't work properly!

FAQ #100359

 

This problem is caused when too many message are contained on the SIM card used in the  GSM Modem. The Poll SMS Fbox get confused when the SIM card contains  too many texts. The last received message is deleted once it has been executed but the messages already present on the SIM card can not be deleted!

Solution: Put back the SIM card on a mobil phone and delete all messages!

Please note that due to the evolution of our mobile phone, it is not possible to delete sms  with a smart phone. You will have to use an older phone. By older phone is supposed to be a phone that still store sms on the sim card.

Example Nokia 6210

In the case you do not have an old phone at your disposal, it is still possible to delete them by using commands on a serial line connected to the modem.

You will need the following: 

1 PC with a RS-232 line

1 serial cable 1:1

1 terminal software. If you do not have one, we suggest you to use the puTTY

the.earth.li/~sgtatham/putty/latest/x86/putty-0.66-installer.exe

 

 

The command

AT+CMGL="ALL"

shows the messages on the SIM.for example:

+CMGL: 1,"REC UNREAD","+31628870634",,"11/01/09,10:26:26+04"

This is text message 1

+CMGL: 2,"REC UNREAD","+31628870634",,"11/01/09,10:26:49+04"

This is text message 2

 

 

Then, you will have to execute the following command in order to delete messages

AT+CMGD=1

OK

AT+CMGD=2
OK

 

 

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Note: There is a GSM modem programming example on our web site for PCD3.M with sending SMS and DTMF fonction using Poll SMS Fbox. (see under Getting Started)!

https://www.sbc-support.com/en/services/archive/getting-started/programm-examples/pg5-20/communication/