diff --git a/src/TinyGsmClientA6.h b/src/TinyGsmClientA6.h
index eb22be6..d1104db 100644
--- a/src/TinyGsmClientA6.h
+++ b/src/TinyGsmClientA6.h
@@ -439,88 +439,6 @@ public:
     return TinyGsmIpFromString(getLocalIP());
   }
 
-  /*
-   * Phone Call functions
-   */
-
-  bool setGsmBusy(bool busy = true) TINY_GSM_ATTR_NOT_AVAILABLE;
-
-  bool callAnswer() {
-    sendAT(GF("A"));
-    return waitResponse() == 1;
-  }
-
-  // Returns true on pick-up, false on error/busy
-  bool callNumber(const String& number) {
-    if (number == GF("last")) {
-      sendAT(GF("DLST"));
-    } else {
-      sendAT(GF("D\""), number, "\";");
-    }
-
-    if (waitResponse(5000L) != 1) {
-      return false;
-    }
-
-    if (waitResponse(60000L,
-        GF(GSM_NL "+CIEV: \"CALL\",1"),
-        GF(GSM_NL "+CIEV: \"CALL\",0"),
-        GFP(GSM_ERROR)) != 1)
-    {
-      return false;
-    }
-
-    int rsp = waitResponse(60000L,
-              GF(GSM_NL "+CIEV: \"SOUNDER\",0"),
-              GF(GSM_NL "+CIEV: \"CALL\",0"));
-
-    int rsp2 = waitResponse(300L, GF(GSM_NL "BUSY" GSM_NL), GF(GSM_NL "NO ANSWER" GSM_NL));
-
-    return rsp == 1 && rsp2 == 0;
-  }
-
-  bool callHangup() {
-    sendAT(GF("H"));
-    return waitResponse() == 1;
-  }
-
-  // 0-9,*,#,A,B,C,D
-  bool dtmfSend(char cmd, unsigned duration_ms = 100) {
-    duration_ms = constrain(duration_ms, 100, 1000);
-
-    // The duration parameter is not working, so we simulate it using delay..
-    // TODO: Maybe there's another way...
-
-    //sendAT(GF("+VTD="), duration_ms / 100);
-    //waitResponse();
-
-    sendAT(GF("+VTS="), cmd);
-    if (waitResponse(10000L) == 1) {
-      delay(duration_ms);
-      return true;
-    }
-    return false;
-  }
-
-  /*
-   * Audio functions
-   */
-
-  bool audioSetHeadphones() {
-    sendAT(GF("+SNFS=0"));
-    return waitResponse() == 1;
-  }
-
-  bool audioSetSpeaker() {
-    sendAT(GF("+SNFS=1"));
-    return waitResponse() == 1;
-  }
-
-  bool audioMuteMic(bool mute) {
-    sendAT(GF("+CMUT="), mute);
-    return waitResponse() == 1;
-  }
-
   /*
    * Messaging functions
    */
diff --git a/src/TinyGsmClientM590.h b/src/TinyGsmClientM590.h
index 07c4e2b..e3d3cd3 100644
--- a/src/TinyGsmClientM590.h
+++ b/src/TinyGsmClientM590.h
@@ -445,18 +445,6 @@ set_dns:
     return TinyGsmIpFromString(getLocalIP());
   }
 
-  /*
-   * Phone Call functions
-   */
-
-  bool setGsmBusy(bool busy = true) TINY_GSM_ATTR_NOT_AVAILABLE;
-
-  bool callAnswer() TINY_GSM_ATTR_NOT_AVAILABLE;
-
-  bool callNumber(const String& number) TINY_GSM_ATTR_NOT_AVAILABLE;
-
-  bool callHangup() TINY_GSM_ATTR_NOT_AVAILABLE;
-
   /*
    * Messaging functions
    */
diff --git a/src/TinyGsmClientSIM800.h b/src/TinyGsmClientSIM800.h
index 074dddc..acdfcf8 100644
--- a/src/TinyGsmClientSIM800.h
+++ b/src/TinyGsmClientSIM800.h
@@ -331,28 +331,6 @@ public:
     return true;
   }
 
-  bool enableBluetooth() {
-    uint16_t state;
-
-    sendAT(GF("+BTPOWER=1"));
-    if (waitResponse() != 1) {
-      return false;
-    }
-
-    return true;
-  }
-
-  bool disableBluetooth() {
-    uint16_t state;
-
-    sendAT(GF("+BTPOWER=0"));
-    if (waitResponse() != 1) {
-      return false;
-    }
-
-    return true;
-  }
-
   /*
     During sleep, the SIM800 module has its serial communication disabled. In order to reestablish communication
     pull the DRT-pin of the SIM800 module LOW for at least 50ms. Then use this function to disable sleep mode.
@@ -599,56 +577,6 @@ public:
     return TinyGsmIpFromString(getLocalIP());
   }
 
-  /*
-   * Phone Call functions
-   */
-
-  bool setGsmBusy(bool busy = true) {
-    sendAT(GF("+GSMBUSY="), busy ? 1 : 0);
-    return waitResponse() == 1;
-  }
-
-  bool callAnswer() {
-    sendAT(GF("A"));
-    return waitResponse() == 1;
-  }
-
-  // Returns true on pick-up, false on error/busy
-  bool callNumber(const String& number) {
-    if (number == GF("last")) {
-      sendAT(GF("DL"));
-    } else {
-      sendAT(GF("D"), number, ";");
-    }
-    int status = waitResponse(60000L,
-                              GFP(GSM_OK),
-                              GF("BUSY" GSM_NL),
-                              GF("NO ANSWER" GSM_NL),
-                              GF("NO CARRIER" GSM_NL));
-    switch (status) {
-    case 1:  return true;
-    case 2:
-    case 3:  return false;
-    default: return false;
-    }
-  }
-
-  bool callHangup() {
-    sendAT(GF("H"));
-    return waitResponse() == 1;
-  }
-
-  // 0-9,*,#,A,B,C,D
-  bool dtmfSend(char cmd, int duration_ms = 100) {
-    duration_ms = constrain(duration_ms, 100, 1000);
-
-    sendAT(GF("+VTD="), duration_ms / 100); // VTD accepts in 1/10 of a second
-    waitResponse();
-
-    sendAT(GF("+VTS="), cmd);
-    return waitResponse(10000L) == 1;
-  }
-
   /*
    * Messaging functions
    */
@@ -679,162 +607,6 @@ public:
     }
   }
 
-  int8_t getSMSInterrupt(void){
-    sendAT(GF("+CFGRI?"));
-    if(waitResponse(GF(GSM_NL "+CFGRI:")) != 1) return -1;
-    return stream.readStringUntil('\n').toInt();
-  }
-
-  bool setSMSInterrupt(uint8_t status){
-    sendAT(GF("+CFGRI="), status);
-    if(waitResponse() != 1) return false;
-    return true;
-  }
-
-  int8_t countSMS(void){
-    sendAT(GF("+CMGF=1"));
-    if(waitResponse() != 1) return -1;
-
-    sendAT(GF("+CPMS?"));
-    if(waitResponse(GF(GSM_NL "+CPMS:")) != 1) return -1;
-
-    streamSkipUntil(',');
-    uint8_t count = stream.readStringUntil(',').toInt() - 1;
-    waitResponse();
-
-    return count;
-  }
-
-  bool deleteSMS(){
-    sendAT(GF("+CMGF=1"));
-    if(waitResponse() != 1) return false;
-
-    sendAT(GF("+CMGDA=\"DEL ALL\""));
-    if(waitResponse() != 1) return false;
-
-    return true;
-  }
-
-  bool deleteSMS(uint8_t i){
-    sendAT(GF("+CMGF=1"));
-    if(waitResponse() != 1) return false;
-
-    sendAT(GF("+CMGD="), i);
-    if(waitResponse() != 1) return false;
-
-    return true;
-  }
-
-  String deleteSMSOpt() {
-    sendAT(GF("+CMGD=?"));
-      if (waitResponse() != 1) {
-        return "";
-      }
-      if (waitResponse(10000L, GF(GSM_NL "+CMGD::")) != 1) {
-        return "";
-      }
-        stream.readStringUntil('"');
-        String indexes = stream.readStringUntil('"');
-        stream.readStringUntil(',');
-        String options = stream.readStringUntil('\n');
-        return indexes;
-      }
-
-  bool readSMS(uint8_t i, String& msg){
-    // set message format to text mode
-    sendAT(GF("+CMGF=1"));
-    if (waitResponse() != 1) return false;
-    // show sms text mode parameters
-    sendAT(GF("+CSDH=1"));
-    if (waitResponse() != 1) return false;
-    // set GSM charset
-    sendAT(GF("+CSCS=\"GSM\""));
-    if (waitResponse() != 1) return false;
-
-    sendAT(GF("+CMGR="), i);
-    uint8_t cmgrResponse = waitResponse(GF(GSM_NL "+CMGR:"));
-    if ( cmgrResponse == 1 ) {
-      streamSkipUntil('\n');
-      msg = stream.readStringUntil('\n');
-      return true;
-    }
-
-    return false;
-  }
-
-  uint8_t getNewSMSIndex() {
-    if (waitResponse(GF(GSM_NL "+CMTI:")) != 1) {
-      return false;
-    }
-
-    streamSkipUntil(',');
-    int res = stream.readStringUntil('\n').toInt();
-    return res;
-  }
-
-  bool readSMSRaw(uint8_t i, String& msg) {
-    // set message format to text mode
-    sendAT(GF("+CMGF=1"));
-    if (waitResponse() != 1) return false;
-    // show sms text mode parameters
-    sendAT(GF("+CSDH=1"));
-    if (waitResponse() != 1) return false;
-    // set GSM charset
-    sendAT(GF("+CSCS=\"GSM\""));
-    if (waitResponse() != 1) return false;
-
-    // get message by index
-    sendAT(GF("+CMGR="), i);
-    uint8_t cmgrResponse = waitResponse(GF(GSM_NL "+CMGR:"));
-    if ( cmgrResponse != 1 ) {
-      return false;
-    }
-
-    msg = stream.readStringUntil('\n') + '\n'
-        + stream.readStringUntil('\n') + '\n';
-
-    if (waitResponse() != 1) {
-      return false;
-    }
-
-    return true;
-  }
-
-  bool readAllSMSRaw(String& msg) {
-    // set message format to text mode
-    sendAT(GF("+CMGF=1"));
-    if (waitResponse() != 1) return false;
-    // show sms text mode parameters
-    sendAT(GF("+CSDH=1"));
-    if (waitResponse() != 1) return false;
-    // set GSM charset
-    sendAT(GF("+CSCS=\"GSM\""));
-    if (waitResponse() != 1) return false;
-
-    // get all messages
-    sendAT(GF("+CMGL=\"ALL\""));
-
-    const unsigned long timeout = 10000L;
-    unsigned long startMillis = millis();
-    bool isTimeout = false;
-    String line;
-    do {
-      line = stream.readStringUntil('\n');
-      line.trim();
-      if ( line != ""  && line != "OK" ) {
-        msg = msg + line + String("\r\n");
-      }
-      isTimeout = (millis() - startMillis) > timeout;
-      delay(0);
-      if ( isTimeout ) {
-        DBG("timeout");
-        break;
-      }
-    } while (line != "OK");
-
-    return (line == "OK");
-  }
-
   bool sendSMS(const String& number, const String& text) {
     sendAT(GF("+CMGF=1"));
     waitResponse();
diff --git a/src/TinyGsmClientU201.h b/src/TinyGsmClientU201.h
index 7548899..64d6f2a 100644
--- a/src/TinyGsmClientU201.h
+++ b/src/TinyGsmClientU201.h
@@ -454,19 +454,6 @@ public:
   IPAddress localIP() {
     return TinyGsmIpFromString(getLocalIP());
   }
-
-  /*
-   * Phone Call functions
-   */
-
-  bool setGsmBusy(bool busy = true) TINY_GSM_ATTR_NOT_IMPLEMENTED;
-
-  bool callAnswer() TINY_GSM_ATTR_NOT_IMPLEMENTED;
-
-  bool callNumber(const String& number) TINY_GSM_ATTR_NOT_IMPLEMENTED;
-
-  bool callHangup() TINY_GSM_ATTR_NOT_IMPLEMENTED;
-
   /*
    * Messaging functions
    */