Operating system name and version: ubuntu 10.1
Version of smsd: 3.1.14
Smsd installed from: sources
Name and model of a modem / phone: GSM Modem
Interface: Serial


how can I load credit to my sim card that I put in my GSM modem?

For example in mobile phone I send: *140*123456789# To operator

Use the regular_run_cmdfile feature. See also description of other regular_run* settings.

Create this directory, and make it writable for smsd:
/var/spool/sms/regular_run

In the modem section of smsd.conf, define:
regular_run_cmdfile = /var/spool/sms/regular_run/GSM1.cmdfile
regular_run_statfile = /var/spool/sms/regular_run/GSM1.statfile

This might also be useful:
regular_run_logfile = /var/log/smsd_regular_run.log

Default interval for handling this file is 300 seconds. It can be changed with a setting:
regular_run_interval = 60

After changing the configuration. restart smsd and check that it's started without any error messages.

When you need to load the credit, store proper USSD command to the GSM1.cmdfile. Write something like this to the first line:
AT+CUSD=1,"*140*123456789#"

Smsd will send this command to the modem, and you can see the answer in the GSM1.statfile. After the cmdfile is handled, it is removed by smsd, so it does not try to load more credit with the same code.

Thank you