diff --git a/src/TinyGsmClientA6.h b/src/TinyGsmClientA6.h
index a7c8f35..ae6803e 100644
--- a/src/TinyGsmClientA6.h
+++ b/src/TinyGsmClientA6.h
@@ -191,6 +191,8 @@ 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/TinyGsmClientBG96.h b/src/TinyGsmClientBG96.h
index e5c7570..b4ae604 100644
--- a/src/TinyGsmClientBG96.h
+++ b/src/TinyGsmClientBG96.h
@@ -204,8 +204,7 @@ class TinyGsmBG96 : public TinyGsmModem<TinyGsmBG96>,
  protected:
   bool restartImpl() {
     if (!testAT()) { return false; }
-    sendAT(GF("+CFUN=1,1"));
-    if (waitResponse(10000L, GF("OK")) != 1) { return false; }
+    if (!setPhoneFunctionality(1, true)) { return false; }
     waitResponse(10000L, GF("APP RDY"));
     return init();
   }
@@ -226,6 +225,11 @@ class TinyGsmBG96 : public TinyGsmModem<TinyGsmBG96>,
     return waitResponse() == 1;
   }
 
+  bool setPhoneFunctionalityImpl(uint8_t fun, bool reset = false) {
+    sendAT(GF("+CFUN="), fun, reset ? ",1" : "");
+    return waitResponse(10000L, GF("OK")) == 1;
+  }
+
   /*
    * 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/TinyGsmClientM590.h b/src/TinyGsmClientM590.h
index 091735b..094049a 100644
--- a/src/TinyGsmClientM590.h
+++ b/src/TinyGsmClientM590.h
@@ -173,8 +173,7 @@ class TinyGsmM590 : public TinyGsmModem<TinyGsmM590>,
  protected:
   bool restartImpl() {
     if (!testAT()) { return false; }
-    sendAT(GF("+CFUN=15"));
-    if (waitResponse(10000L) != 1) { return false; }
+    if (!setPhoneFunctionality(15)) { return false; }
     // MODEM:STARTUP
     waitResponse(60000L, GF(GSM_NL "+PBREADY" GSM_NL));
     return init();
@@ -190,6 +189,11 @@ class TinyGsmM590 : public TinyGsmModem<TinyGsmM590>,
     return waitResponse() == 1;
   }
 
+  bool setPhoneFunctionalityImpl(uint8_t fun, bool reset = false) {
+    sendAT(GF("+CFUN="), fun, reset ? ",1" : "");
+    return waitResponse(10000L) == 1;
+  }
+
   /*
    * Generic network functions
    */
diff --git a/src/TinyGsmClientM95.h b/src/TinyGsmClientM95.h
index fdb2c45..ad94449 100644
--- a/src/TinyGsmClientM95.h
+++ b/src/TinyGsmClientM95.h
@@ -227,6 +227,8 @@ 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/TinyGsmClientMC60.h b/src/TinyGsmClientMC60.h
index ed63281..d9b9cd1 100644
--- a/src/TinyGsmClientMC60.h
+++ b/src/TinyGsmClientMC60.h
@@ -199,10 +199,8 @@ class TinyGsmMC60 : public TinyGsmModem<TinyGsmMC60>,
  protected:
   bool restartImpl() {
     if (!testAT()) { return false; }
-    sendAT(GF("+CFUN=0"));
-    if (waitResponse(10000L) != 1) { return false; }
-    sendAT(GF("+CFUN=1,1"));
-    if (waitResponse(10000L) != 1) { return false; }
+    if (!setPhoneFunctionality(0)) { return false; }
+    if (!setPhoneFunctionality(1, true)) { return false; }
     delay(3000);
     return init();
   }
@@ -222,6 +220,11 @@ class TinyGsmMC60 : public TinyGsmModem<TinyGsmMC60>,
     return waitResponse() == 1;
   }
 
+  bool setPhoneFunctionalityImpl(uint8_t fun, bool reset = false) {
+    sendAT(GF("+CFUN="), fun, reset ? ",1" : "");
+    return waitResponse(10000L) == 1;
+  }
+
   /*
    * Generic network functions
    */
diff --git a/src/TinyGsmClientSIM5360.h b/src/TinyGsmClientSIM5360.h
index a70f740..6b184d4 100644
--- a/src/TinyGsmClientSIM5360.h
+++ b/src/TinyGsmClientSIM5360.h
@@ -234,8 +234,7 @@ class TinyGsmSim5360 : public TinyGsmModem<TinyGsmSim5360>,
   }
 
   bool radioOffImpl() {
-    sendAT(GF("+CFUN=4"));
-    if (waitResponse(10000L) != 1) { return false; }
+    if (!setPhoneFunctionality(4)) { return false; }  
     delay(3000);
     return true;
   }
@@ -245,6 +244,11 @@ class TinyGsmSim5360 : public TinyGsmModem<TinyGsmSim5360>,
     return waitResponse() == 1;
   }
 
+  bool setPhoneFunctionalityImpl(uint8_t fun, bool reset = false) {
+    sendAT(GF("+CFUN="), fun, reset ? ",1" : "");
+    return waitResponse(10000L) == 1;
+  }
+
   /*
    * Generic network functions
    */
diff --git a/src/TinyGsmClientSIM7000.h b/src/TinyGsmClientSIM7000.h
index deae5fe..7960ef6 100644
--- a/src/TinyGsmClientSIM7000.h
+++ b/src/TinyGsmClientSIM7000.h
@@ -213,10 +213,8 @@ class TinyGsmSim7000 : public TinyGsmModem<TinyGsmSim7000>,
    */
  protected:
   bool restartImpl() {
-    sendAT(GF("+CFUN=0"));
-    if (waitResponse(10000L) != 1) { return false; }
-    sendAT(GF("+CFUN=1,1"));
-    if (waitResponse(10000L) != 1) { return false; }
+    if (!setPhoneFunctionality(0)) { return false; }
+    if (!setPhoneFunctionality(1, true)) { return false; }
     waitResponse(10000L, GF("SMS Ready"), GF("RDY"));
     return init();
   }
@@ -235,6 +233,11 @@ class TinyGsmSim7000 : public TinyGsmModem<TinyGsmSim7000>,
     return waitResponse() == 1;
   }
 
+  bool setPhoneFunctionalityImpl(uint8_t fun, bool reset = false) {
+    sendAT(GF("+CFUN="), fun, reset ? ",1" : "");
+    return waitResponse(10000L) == 1;
+  }
+
   /*
    * Generic network functions
    */
diff --git a/src/TinyGsmClientSIM7600.h b/src/TinyGsmClientSIM7600.h
index 8a3633c..b592853 100644
--- a/src/TinyGsmClientSIM7600.h
+++ b/src/TinyGsmClientSIM7600.h
@@ -233,8 +233,7 @@ class TinyGsmSim7600 : public TinyGsmModem<TinyGsmSim7600>,
   }
 
   bool radioOffImpl() {
-    sendAT(GF("+CFUN=4"));
-    if (waitResponse(10000L) != 1) { return false; }
+    if (!setPhoneFunctionality(4)) { return false; }
     delay(3000);
     return true;
   }
@@ -244,6 +243,11 @@ class TinyGsmSim7600 : public TinyGsmModem<TinyGsmSim7600>,
     return waitResponse() == 1;
   }
 
+  bool setPhoneFunctionalityImpl(uint8_t fun, bool reset = false) {
+    sendAT(GF("+CFUN="), fun, reset ? ",1" : "");
+    return waitResponse(10000L) == 1;
+  }
+
   /*
    * Generic network functions
    */
diff --git a/src/TinyGsmClientSIM800.h b/src/TinyGsmClientSIM800.h
index 88e1429..2e612fd 100644
--- a/src/TinyGsmClientSIM800.h
+++ b/src/TinyGsmClientSIM800.h
@@ -254,10 +254,8 @@ class TinyGsmSim800 : public TinyGsmModem<TinyGsmSim800>,
     if (!testAT()) { return false; }
     sendAT(GF("&W"));
     waitResponse();
-    sendAT(GF("+CFUN=0"));
-    if (waitResponse(10000L) != 1) { return false; }
-    sendAT(GF("+CFUN=1,1"));
-    if (waitResponse(10000L) != 1) { return false; }
+    if (!setPhoneFunctionality(0)) { return false; } 
+    if (!setPhoneFunctionality(1, true)) { return false; }
     delay(3000);
     return init();
   }
@@ -276,6 +274,15 @@ class TinyGsmSim800 : public TinyGsmModem<TinyGsmSim800>,
     return waitResponse() == 1;
   }
 
+  // <fun> 0 Minimum functionality
+  // <fun> 1 Full functionality (Default)
+  // <fun> 4 Disable phone both transmit and receive RF circuits.
+  // <rst> Reset the MT before setting it to <fun> power level.
+  bool setPhoneFunctionalityImpl(uint8_t fun, bool reset = false) {
+    sendAT(GF("+CFUN="), fun, reset ? ",1" : "");
+    return waitResponse(10000L) == 1;
+  }
+
   /*
    * Generic network functions
    */
diff --git a/src/TinyGsmClientSaraR4.h b/src/TinyGsmClientSaraR4.h
index 75e85cc..4ac42cf 100644
--- a/src/TinyGsmClientSaraR4.h
+++ b/src/TinyGsmClientSaraR4.h
@@ -299,8 +299,7 @@ class TinyGsmSaraR4 : public TinyGsmModem<TinyGsmSaraR4>,
   // using +CFUN=15 instead of the more common CFUN=1,1
   bool restartImpl() {
     if (!testAT()) { return false; }
-    sendAT(GF("+CFUN=15"));
-    if (waitResponse(10000L) != 1) { return false; }
+    if (!setPhoneFunctionality(15)) { return false; }
     delay(3000);  // TODO(?):  Verify delay timing here
     return init();
   }
@@ -312,6 +311,11 @@ class TinyGsmSaraR4 : public TinyGsmModem<TinyGsmSaraR4>,
 
   bool sleepEnableImpl(bool enable = true) TINY_GSM_ATTR_NOT_AVAILABLE;
 
+  bool setPhoneFunctionalityImpl(uint8_t fun, bool reset = false) {
+    sendAT(GF("+CFUN="), fun, reset ? ",1" : "");
+    return waitResponse(10000L) == 1;
+  }
+
   /*
    * Generic network functions
    */
diff --git a/src/TinyGsmClientSequansMonarch.h b/src/TinyGsmClientSequansMonarch.h
index 0caff1c..654fc5e 100644
--- a/src/TinyGsmClientSequansMonarch.h
+++ b/src/TinyGsmClientSequansMonarch.h
@@ -316,6 +316,8 @@ 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/TinyGsmClientUBLOX.h b/src/TinyGsmClientUBLOX.h
index 585f630..cb8750d 100644
--- a/src/TinyGsmClientUBLOX.h
+++ b/src/TinyGsmClientUBLOX.h
@@ -236,8 +236,7 @@ class TinyGsmUBLOX : public TinyGsmModem<TinyGsmUBLOX>,
   bool factoryDefaultImpl() {
     sendAT(GF("+UFACTORY=0,1"));  // No factory restore, erase NVM
     waitResponse();
-    sendAT(GF("+CFUN=16"));  // Reset
-    return waitResponse() == 1;
+    return setPhoneFunctionality(16); // Reset
   }
 
   /*
@@ -246,8 +245,7 @@ class TinyGsmUBLOX : public TinyGsmModem<TinyGsmUBLOX>,
  protected:
   bool restartImpl() {
     if (!testAT()) { return false; }
-    sendAT(GF("+CFUN=16"));
-    if (waitResponse(10000L) != 1) { return false; }
+    if (!setPhoneFunctionality(16)) { return false; }
     delay(3000);  // TODO(?):  Verify delay timing here
     return init();
   }
@@ -259,6 +257,11 @@ class TinyGsmUBLOX : public TinyGsmModem<TinyGsmUBLOX>,
 
   bool sleepEnableImpl(bool enable = true) TINY_GSM_ATTR_NOT_AVAILABLE;
 
+  bool setPhoneFunctionalityImpl(uint8_t fun, bool reset = false) {
+    sendAT(GF("+CFUN="), fun, reset ? ",1" : "");
+    return waitResponse(10000L) == 1;
+  }
+
   /*
    * 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 e6bd28e..0cbfc33 100644
--- a/src/TinyGsmModem.tpp
+++ b/src/TinyGsmModem.tpp
@@ -65,6 +65,9 @@ class TinyGsmModem {
   bool sleepEnable(bool enable = true) {
     return thisModem().sleepEnableImpl(enable);
   }
+  bool setPhoneFunctionality(uint8_t fun, bool reset = false) {
+    return thisModem().setPhoneFunctionalityImpl(fun, reset);
+  }
 
   /*
    * Generic network functions
@@ -164,14 +167,15 @@ class TinyGsmModem {
    */
  protected:
   bool radioOffImpl() {
-    thisModem().sendAT(GF("+CFUN=0"));
-    if (thisModem().waitResponse(10000L) != 1) { return false; }
+    if (!thisModem().setPhoneFunctionality(0)) { return false; }
     delay(3000);
     return true;
   }
 
   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
    */