Migrate from https://cmakerhk.wordpress.com/2019/05/16/gprs-a9-module-at-command-list/
https://wiki.ai-thinker.com/gprs
//
AT+CGDCONT=1,”IP”,”cmhk”<\r><\n>
AT+CGATT=1<\r><\n>
AT+CGACT=1,1<\r><\n>
//
AT+CDNSGIP=”erp.hkite.com”<\r><\n>
Test the DNS, and check with terminal
host -a erp.hkite.com
//Base station location
+CREG: 2,1,”00A0″,”0D37″<\r><\n>
<\r><\n>
OK<\r><\n>
MCC:454 -> HK//http://www.gpsspg.com/bs/mcc.htm
MNC: 12 -> CMHK//http://www.gpsspg.com/bs/mnc.htm
LAC: 160 -> 0xA0
CI:3383 -> 0xD37