+CMS ERROR 41 on Telit Modem

Question

I am a developer, working on "Telit" GE865-Quad using AT commands.

I am planning an application, witch sends SMS when certain condition occurs. When the application does not send SMS the modem is shut-down (Therefore every time I want to send SMS I have to turn on the modem). This application sends 3 SMS to different numbers one after the other.

The application is working just fine. The problem apear after a while (after sending certain amount of SMS), when I give the command to send SMS I get "+CMS ERROR 41" ("Temporary failure"). Once this message appear, every time I try to send SMS I get the same ERROR - It is like the SIM card is stuck. The only way I have found to get rid of this error is to enter the SIM card to my privet phone and send SMS.

I have spoken to "Telit" representative and he could not give a satisfying answer other then adding more delay between messages.

This is some of the relevant code :

(Turning on sequence) // From "Telit" GE865-Quad DataSheet

> #QSS: 3 //Before I start working with the modem i wait for this response with means the SIM is ready to use and the registration is to cellular network is complete*/

AT+CMGF=1 // Text Mode

OK

AT+CMGS=+xxxxxxxxxxxx // My number.

"This is the message i want to send" //Preparing the desired message require some coding But I think this is irrelevant to the subject.

//Delay for 3 secs//

And again : AT+CMGS=+xxxxxxxxxxxx // My number.

"This is the message I want to send"

//Delay for 3 secs//

(The same thing one more time)

The questions are:

1. Why does it happen, what am I doing wrong??
2. How can I unblock the SIM? What does the phone do so I can keep sending SMS? The purpose is the keep sending SMS automatically.

This is the first time I publish a message in this website so if something is unclear please let me know. :)

Thanks for all the helpers. Itay.

Answer 1

today i encountered this +CMS ERROR: 41 error, many times. There was about 40 unread messages in the receiving modem. After i deleted all received messages error disappeared. I think may be operator is protecting customers from spam. Dmitri

Answer 2

It is due Either SMS service on your SIM is not available or your SMS subscription is expired.