diff --git a/src/main.cpp b/src/main.cpp
index 69eb401..6286ec5 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -338,6 +338,9 @@ void callNumber(String number)
 	String contact = mp.checkContact(number);
 	mp.inCall = 1;
 	mp.dataRefreshFlag = 0;
+	bool muted = false;
+	const byte *current_call_icon = call_icon;
+	uint16_t current_call_icon_color = TFT_GREEN;
 	char c;
 	String localBuffer = "";
 	String buffer = "";
@@ -516,6 +519,24 @@ void callNumber(String number)
 				callState = 1;
 			}
 		}
+		if (mp.buttons.pressed(14)) // mute, 14 is power button
+		{
+			if (mp.sim_module_version == 1 || mp.sim_module_version == 0)
+			{
+				muted = !muted;
+				Serial1.print(F("AT+CMUT="));
+				if (muted) {
+					current_call_icon = call_icon_muted;
+					current_call_icon_color = TFT_RED;
+					Serial1.println(1);
+				} else {
+					current_call_icon = call_icon;
+					current_call_icon_color = TFT_GREEN;
+					Serial1.println(0);
+				}
+				mp.waitForOK();
+			}
+		}
 		if (mp.buttons.pressed(BTN_FUN_RIGHT)) // hanging up
 		{
 			
@@ -662,7 +683,7 @@ void callNumber(String number)
 				}
 				mp.display.setCursor(9, 9);
 				mp.display.printCenter(temp);
-				mp.display.drawBitmap(29*scale, 24*scale, call_icon, TFT_GREEN, scale);
+				mp.display.drawBitmap(29*scale, 24*scale, current_call_icon, current_call_icon_color, scale);
 				mp.display.setCursor(11, 28);
 				if(contact == "")
 					mp.display.printCenter(number);
diff --git a/src/sprites.c b/src/sprites.c
index 6e94bcf..370402b 100644
--- a/src/sprites.c
+++ b/src/sprites.c
@@ -489,6 +489,31 @@ const byte call_icon[] PROGMEM = { 24,22,
 	B00000000,B00000111,B11100000,
 };
 
+const byte call_icon_muted[] PROGMEM = { 24,22,
+	B00011100,B00000000,B00000111,
+	B00111110,B00000000,B00001110,
+	B01111111,B00000000,B00011100,
+	B11111111,B10000000,B00111000,
+	B11111111,B10000000,B01110000,
+	B11111111,B00000000,B11100000,
+	B11111110,B00000001,B11000000,
+	B11111110,B00000011,B10000000,
+	B11111110,B00000111,B00000000,
+	B01111111,B00001110,B00000000,
+	B01111111,B10011100,B00000000,
+	B00111111,B11111000,B00000000,
+	B00011111,B11110000,B00000000,
+	B00001111,B11110000,B01100000,
+	B00000111,B11111000,B11110000,
+	B00000011,B11111111,B11111000,
+	B00000111,B11111111,B11111100,
+	B00001110,B11111111,B11111100,
+	B00011100,B01111111,B11111100,
+	B00111000,B00111111,B11111000,
+	B01110000,B00011111,B11110000,
+	B11100000,B00000111,B11100000,
+};
+
 //Lock screen notification icons
 const byte batteryChargingIcon[] PROGMEM = {
 	8,7,