Hello,
You can send and read SMS messages from device webUI in Services -> SMS Utilities -> SMS Management -> Read/Send SMS.
If you want to read/send SMS messages for example via SSH/CLI then yo read SMS messages use: gsmtcl -S -r [index] Read SMS by index, example:
root@Teltonika-RUT950:~# gsmctl -S -r 1
Index: 1
Date: 2019-10-15 09:53:57
Sender: +3706xxxxxxx
Status: read
Text: Admin159 status
To send SMS use: gsmctl -S -s "<Number> <Text>" Send SMS. IMPORTANT! Number and text must be within quotes, example: gmsctl -S -s "+3706xxxxxxx Text you want to send"
