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SIM800 Series_AT Command Manual_V1.09 354 2015-08-03
versions)
+CGREG:
<stat>[,<lac>,<ci>]
Network Registration Status AT+CGRE G=<n>
ALARM RING
+CALV: <n>
Indicate expired alarm. AT+CALA=<time
>[,<n>[,<recurr>]]