From 49c2653dcaefdd9c41e74c8463080b74ea22975f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Adri=C3=A1n=20Cervera=20And=C3=A9s?= <acervera@iti.es>
Date: Tue, 11 Feb 2020 10:12:59 +0100
Subject: [PATCH] Added support for IMSI information on SIM800 and SIM808
 modules

---
 src/TinyGsmClientSIM800.h |  2 ++
 src/TinyGsmCommon.h       | 14 ++++++++++++++
 2 files changed, 16 insertions(+)

diff --git a/src/TinyGsmClientSIM800.h b/src/TinyGsmClientSIM800.h
index be225d5..51347ab 100644
--- a/src/TinyGsmClientSIM800.h
+++ b/src/TinyGsmClientSIM800.h
@@ -321,6 +321,8 @@ TINY_GSM_MODEM_GET_SIMCCID_CCID()
 
 TINY_GSM_MODEM_GET_IMEI_GSN()
 
+TINY_GSM_MODEM_GET_IMSI_CIMI()
+
   SimStatus getSimStatus(unsigned long timeout_ms = 10000L) {
     for (unsigned long start = millis(); millis() - start < timeout_ms; ) {
       sendAT(GF("+CPIN?"));
diff --git a/src/TinyGsmCommon.h b/src/TinyGsmCommon.h
index bb2e541..d176554 100644
--- a/src/TinyGsmCommon.h
+++ b/src/TinyGsmCommon.h
@@ -527,6 +527,20 @@ String TinyGsmDecodeHex16bit(String &instr) {
   }
 
 
+// Asks for International Mobile Subscriber Identity IMSI via the AT+CIMI command
+#define TINY_GSM_MODEM_GET_IMSI_CIMI() \
+  String getIMSI() { \
+    sendAT(GF("+CIMI")); \
+    if (waitResponse(GF(GSM_NL)) != 1) { \
+      return ""; \
+    } \
+    String res = stream.readStringUntil('\n'); \
+    waitResponse(); \
+    res.trim(); \
+    return res; \
+  }
+
+
 // Gets the modem's registration status via CREG/CGREG/CEREG
 // CREG = Generic network registration
 // CGREG = GPRS service registration