Removed all phone and bluetooth fxns

And keeping only most basic SMS

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
    */