diff --git a/src/TinyGsmClientA6.h b/src/TinyGsmClientA6.h
index 0983597..3a344fa 100644
--- a/src/TinyGsmClientA6.h
+++ b/src/TinyGsmClientA6.h
@@ -190,6 +190,8 @@ class TinyGsmA6 : public TinyGsmModem<TinyGsmA6>,
 
   bool sleepEnableImpl(bool enable = true) TINY_GSM_ATTR_NOT_AVAILABLE;
 
+  bool setPhoneFunctionalityImpl(uint8_t fun, bool reset = false) TINY_GSM_ATTR_NOT_IMPLEMENTED;
+
   /*
    * Generic network functions
    */
diff --git a/src/TinyGsmClientESP8266.h b/src/TinyGsmClientESP8266.h
index 9a8687a..38d8a50 100644
--- a/src/TinyGsmClientESP8266.h
+++ b/src/TinyGsmClientESP8266.h
@@ -200,6 +200,8 @@ class TinyGsmESP8266 : public TinyGsmModem<TinyGsmESP8266>,
 
   bool sleepEnableImpl(bool enable = true) TINY_GSM_ATTR_NOT_AVAILABLE;
 
+  bool setPhoneFunctionalityImpl(uint8_t fun, bool reset = false) TINY_GSM_ATTR_NOT_IMPLEMENTED;
+
   /*
    * Generic network functions
    */
diff --git a/src/TinyGsmClientM95.h b/src/TinyGsmClientM95.h
index a0878ab..16a07e0 100644
--- a/src/TinyGsmClientM95.h
+++ b/src/TinyGsmClientM95.h
@@ -226,6 +226,8 @@ class TinyGsmM95 : public TinyGsmModem<TinyGsmM95>,
     return waitResponse() == 1;
   }
 
+  bool setPhoneFunctionalityImpl(uint8_t fun, bool reset = false) TINY_GSM_ATTR_NOT_IMPLEMENTED;
+
   /*
    * Generic network functions
    */
diff --git a/src/TinyGsmClientSequansMonarch.h b/src/TinyGsmClientSequansMonarch.h
index 8f85edd..393a918 100644
--- a/src/TinyGsmClientSequansMonarch.h
+++ b/src/TinyGsmClientSequansMonarch.h
@@ -315,6 +315,8 @@ class TinyGsmSequansMonarch
     return waitResponse() == 1;
   }
 
+  bool setPhoneFunctionality(uint8_t fun, bool reset = false) TINY_GSM_ATTR_NOT_IMPLEMENTED;
+
   /*
    * Generic network functions
    */
diff --git a/src/TinyGsmClientXBee.h b/src/TinyGsmClientXBee.h
index e3b39a0..0669351 100644
--- a/src/TinyGsmClientXBee.h
+++ b/src/TinyGsmClientXBee.h
@@ -572,6 +572,8 @@ class TinyGsmXBee : public TinyGsmModem<TinyGsmXBee>,
 
   bool sleepEnableImpl(bool enable = true) TINY_GSM_ATTR_NOT_IMPLEMENTED;
 
+  bool setPhoneFunctionalityImpl(uint8_t fun, bool reset = false) TINY_GSM_ATTR_NOT_IMPLEMENTED;
+
   /*
    * Generic network functions
    */
diff --git a/src/TinyGsmModem.tpp b/src/TinyGsmModem.tpp
index 519b3c4..b813bea 100644
--- a/src/TinyGsmModem.tpp
+++ b/src/TinyGsmModem.tpp
@@ -66,7 +66,7 @@ class TinyGsmModem {
     return thisModem().sleepEnableImpl(enable);
   }
   bool setPhoneFunctionality(uint8_t fun, bool reset = false) {
-    return thisModem().setPhoneFunctionality(fun, reset);
+    return thisModem().setPhoneFunctionalityImpl(fun, reset);
   }
 
   /*
@@ -174,6 +174,8 @@ class TinyGsmModem {
 
   bool sleepEnableImpl(bool enable = true) TINY_GSM_ATTR_NOT_IMPLEMENTED;
 
+  bool setPhoneFunctionalityImpl(uint8_t fun, bool reset = false) TINY_GSM_ATTR_NOT_IMPLEMENTED;
+
   /*
    * Generic network functions
    */