Specifications

GT300 @Track Air Interface Protocol
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4.13. SIM Card Binding
The backend server could use the command AT+GTBND to make a binding between the device
and the installed SIM card. Thus if an un-authorized SIM card is swapped in, the device will
automatically report its current position via SMS to the backend server. From the report SMS,
the backend thus can trace the phone number of the un-authorized SIM card and track the device.
Example 1:
To enable the binding check:
AT+GTBND=gt300,1,,,,,000A
This will enable the binding check. If there is not a binding, the device makes a binding with the
current installed SIM card immediately. Later, every time the device powers on, it will check if
the bound SIM card has been swapped. If swapped, the device will report its current position via
SMS by message +RESP:GTBND to the backend server.
The response message:
+RESP:GTBND,135790246811220,1,0,0,1,4.3,92,70.0,1,121.354335,31.222073,2009010100000
0,0460,0000,18d8,6141,00,11F0,0102070202
Example 2:
To accept a new SIM card:
AT+GTBND=gt300,2,,,,,000A
If for any reason, the device needs to install a new SIM card, the backend server can send this
command to the device. The device will make a new binding with the current installed SIM card
and keep the binding check enable.
Example 3:
To disable the binding check:
AT+GTBND=gt300,0,,,,,000A
This will disable the binding check. The built binding will be saved.