diff --git a/README.md b/README.md
index 2784cfe..4ab951a 100644
--- a/README.md
+++ b/README.md
@@ -116,9 +116,8 @@ Watch this repo for new updates! And of course, contributions are welcome ;)
     - SIM800, SIM and SIM7000 only
 
 **Credits**
-- Primary Author/Contributor:
+- Primary Authors/Contributors:
     - [vshymanskyy](https://github.com/vshymanskyy)
-- Digi XBee, editing of all modules:
     - [SRGDamia1](https://github.com/SRGDamia1/)
 - SIM7000:
     - [captFuture](https://github.com/captFuture/)
diff --git a/src/TinyGsmClientA6.h b/src/TinyGsmClientA6.h
index ad09572..67dc515 100644
--- a/src/TinyGsmClientA6.h
+++ b/src/TinyGsmClientA6.h
@@ -596,7 +596,7 @@ protected:
     return len;
   }
 
-  bool modemGetConnected(uint8_t mux) {
+  bool modemGetConnected(uint8_t) {
     sendAT(GF("+CIPSTATUS")); //TODO mux?
     int res = waitResponse(GF(",\"CONNECTED\""), GF(",\"CLOSED\""), GF(",\"CLOSING\""), GF(",\"INITIAL\""));
     waitResponse();
diff --git a/src/TinyGsmClientSIM800.h b/src/TinyGsmClientSIM800.h
index 229e986..1abadf8 100644
--- a/src/TinyGsmClientSIM800.h
+++ b/src/TinyGsmClientSIM800.h
@@ -323,6 +323,8 @@ 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?"));
@@ -700,7 +702,7 @@ TINY_GSM_MODEM_WAIT_FOR_NETWORK()
   }
 
   uint8_t getBattChargeState() {
-    sendAT(GF("+CBC?"));
+    sendAT(GF("+CBC"));
     if (waitResponse(GF(GSM_NL "+CBC:")) != 1) {
       return false;
     }
@@ -712,7 +714,7 @@ TINY_GSM_MODEM_WAIT_FOR_NETWORK()
   }
 
   bool getBattStats(uint8_t &chargeState, int8_t &percent, uint16_t &milliVolts) {
-    sendAT(GF("+CBC?"));
+    sendAT(GF("+CBC"));
     if (waitResponse(GF(GSM_NL "+CBC:")) != 1) {
       return false;
     }
diff --git a/src/TinyGsmCommon.h b/src/TinyGsmCommon.h
index 6e8bf37..a7b46d7 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