diff --git a/src/TinyGsmClientBG96.h b/src/TinyGsmClientBG96.h
index b5c36a0..ad777a2 100644
--- a/src/TinyGsmClientBG96.h
+++ b/src/TinyGsmClientBG96.h
@@ -203,8 +203,7 @@ 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();
   }
@@ -225,6 +224,11 @@ 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/TinyGsmClientM590.h b/src/TinyGsmClientM590.h
index 8b915ee..6a8986f 100644
--- a/src/TinyGsmClientM590.h
+++ b/src/TinyGsmClientM590.h
@@ -172,8 +172,7 @@ 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();
@@ -189,6 +188,11 @@ 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/TinyGsmClientMC60.h b/src/TinyGsmClientMC60.h
index a71e96a..7e177a4 100644
--- a/src/TinyGsmClientMC60.h
+++ b/src/TinyGsmClientMC60.h
@@ -198,10 +198,8 @@ 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();
   }
@@ -221,6 +219,11 @@ 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 7ce9b50..ea63454 100644
--- a/src/TinyGsmClientSIM5360.h
+++ b/src/TinyGsmClientSIM5360.h
@@ -233,8 +233,7 @@ 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;
   }
@@ -244,6 +243,11 @@ 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 eab1d68..bc56fae 100644
--- a/src/TinyGsmClientSIM7000.h
+++ b/src/TinyGsmClientSIM7000.h
@@ -212,10 +212,8 @@ 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();
   }
@@ -234,6 +232,11 @@ 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 d2f2c35..38aa092 100644
--- a/src/TinyGsmClientSIM7600.h
+++ b/src/TinyGsmClientSIM7600.h
@@ -232,8 +232,7 @@ 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;
   }
@@ -243,6 +242,11 @@ 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 cabfaca..a6bdcaf 100644
--- a/src/TinyGsmClientSIM800.h
+++ b/src/TinyGsmClientSIM800.h
@@ -253,10 +253,8 @@ 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();
   }
@@ -275,6 +273,15 @@ 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 09dbd9f..816e5d4 100644
--- a/src/TinyGsmClientSaraR4.h
+++ b/src/TinyGsmClientSaraR4.h
@@ -298,8 +298,7 @@ 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();
   }
@@ -311,6 +310,11 @@ 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/TinyGsmClientUBLOX.h b/src/TinyGsmClientUBLOX.h
index 98ea7a0..764a223 100644
--- a/src/TinyGsmClientUBLOX.h
+++ b/src/TinyGsmClientUBLOX.h
@@ -235,8 +235,7 @@ 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
   }
 
   /*
@@ -245,8 +244,7 @@ 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();
   }
@@ -258,6 +256,11 @@ 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/TinyGsmModem.tpp b/src/TinyGsmModem.tpp
index d088546..519b3c4 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().setPhoneFunctionality(fun, reset);
+  }
 
   /*
    * Generic network functions
@@ -164,8 +167,7 @@ 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;
   }