This is the case with Verizon SIM cards, I assume.
Could you try one of the following commands:
- gsmctl -A 'AT+CGREG?'
- gsmctl -A 'AT+CEREG?
According to AT commands manual, they return the following output:
The LAC part can be obtained again by cutting:
- gsmctl -A 'AT+CGREG?' | cut -d'"' -f 2
Be aware that the commands return LAC value in hexadecimal, thus it must be converted to decimal.