diff --git a/src/button_utils.cpp b/src/button_utils.cpp
index 5b18cb0..7928546 100644
--- a/src/button_utils.cpp
+++ b/src/button_utils.cpp
@@ -1,5 +1,6 @@
 #include <logger.h>
 #include "configuration.h"
+#include "station_utils.h"
 #include "button_utils.h"
 #include "msg_utils.h"
 #include "display.h"
@@ -74,6 +75,7 @@ namespace BUTTON_Utils {
       display_toggle(true);
       displayTime = millis();
       show_display("__INFO____", "", "CHANGING CALLSIGN ...", 1000);
+      STATION_Utils::saveCallsingIndex(myBeaconsIndex);
     } else if (menuDisplay == 1) {
       MSG_Utils::deleteFile();
       show_display("__INFO____", "", "ALL MESSAGES DELETED!", 2000);
diff --git a/src/station_utils.cpp b/src/station_utils.cpp
index 2ef648b..8a63376 100644
--- a/src/station_utils.cpp
+++ b/src/station_utils.cpp
@@ -1,4 +1,5 @@
 #include <TinyGPS++.h>
+#include <SPIFFS.h>
 #include <vector>
 #include "station_utils.h"
 #include "configuration.h"
@@ -426,4 +427,34 @@ namespace STATION_Utils {
     }
   }
 
+  void saveCallsingIndex(int index) {
+    if(!SPIFFS.begin(true)) {
+      Serial.println("An Error has occurred while mounting SPIFFS");
+      return;
+    }
+
+    /*if (SPIFFS.exists("/file.txt")) {
+      Serial.println("File exists in SPIFFS");
+    } else {
+      Serial.println("File does not exist in SPIFFS");
+    }*/
+
+    File fileCallsignIndex = SPIFFS.open("/callsignIndex.txt", "w");
+    if(!fileCallsignIndex){
+      Serial.println("no existe archivo, se escribe");
+      Serial.println("Failed to open APRS_Msg for reading");
+      //return;
+    } else {
+      Serial.println("ya existe archivo pero se SOBRE escribe");
+    }
+    String dataToSave = String(index);
+
+    if (fileCallsignIndex.println(dataToSave)) {
+      Serial.println("Callsign Index saved to SPIFFS");
+    } else {
+      Serial.println("Error saving data to file");
+    }
+    fileCallsignIndex.close();
+  }
+
 }
\ No newline at end of file
diff --git a/src/station_utils.h b/src/station_utils.h
index 18b0d58..26a1597 100644
--- a/src/station_utils.h
+++ b/src/station_utils.h
@@ -17,6 +17,7 @@ void checkSmartBeaconInterval(int speed);
 void checkStandingUpdateTime();
 void checkSmartBeaconState();
 void sendBeacon();
+void saveCallsingIndex(int index);
 
 }