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see: How to test the SMS send script:
Location of incoming SMS: /var/spool/sms/incoming/ –>ID
Delete or uncomment the sms-control script:
ret = nb_sms_delete(msgs[i]);\\
if (ret == 0) nb_syslog("deleted message %s", msgs[i]);\\
So that the SMS won't be deleted after receiving and is now available to users for further processing.