If you want to clarify the SMS commands for setting up the GT06 tracker, it is best to contact the seller or the manufacturer of the tracker. It is they who have the most comprehensive expertise on this issue. Also, SMS commands can be found in the instructions for the tracker.
The problem with the GT06 tracker is that several manufacturers produce such a model of the tracker, while these models can work with different protocols.
This topic has been repeatedly discussed on our forum (for example, https://forum.gps-trace.com/d/340-how-to-connect-trackers-of-types-gt06-gt06n-gt02-gt02a-tk110-and-etc). Using the search you can find out the experience of other users in connecting this device to our system.
If you are unable to connect your tracker to our system, please write to us at firstname.lastname@example.org with the login, unit ID, screenshot of device configuration (SMS commands that you tried to send to the tracker and device’s answer) and link to this topic, then we will try to check additionally and help you.