diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..722d5e7
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+.vscode
diff --git a/phoneinput.js b/phoneinput.js
index c6f83ce..1eee883 100644
--- a/phoneinput.js
+++ b/phoneinput.js
@@ -28,11 +28,16 @@ document.addEventListener("DOMContentLoaded", function () {
             formattedInputValue = "";
 
         if (!inputNumbersValue) {
-            return input.value = "";
+            return input.value = (e.data == "+") ? "+" : "";
         }
 
         if (input.value.length != selectionStart) {
             // Editing in the middle of input, not last symbol
+            if (input.value[0] != '+'){ // Add "+" if input value startswith not "+"
+                var oldSelectionStart = input.selectionStart
+                input.value = '+' + input.value;
+                input.selectionStart = input.selectionEnd = oldSelectionStart + 1
+            }
             if (e.data && /\D/g.test(e.data)) {
                 // Attempt to input non-numeric symbol
                 input.value = inputNumbersValue;
@@ -62,10 +67,22 @@ document.addEventListener("DOMContentLoaded", function () {
         input.value = formattedInputValue;
     }
     var onPhoneKeyDown = function (e) {
-        // Clear input after remove last symbol
         var inputValue = e.target.value.replace(/\D/g, '');
         if (e.keyCode == 8 && inputValue.length == 1) {
+            // Clear input after remove last symbol
             e.target.value = "";
+        } else if ([8, 46].indexOf(e.keyCode) > -1 && inputValue.length > 1) {
+            // Prevent when removing service symbols
+            var symToClear
+            switch (e.keyCode) {
+                case 8: // BackSpace key
+                    symToClear = e.target.value[e.target.selectionStart - 1];
+                    break;
+                case 46: // Delete key
+                    symToClear = e.target.value[e.target.selectionStart];
+                    break;
+            }
+            if (symToClear && /\D/.test(symToClear)) e.preventDefault();
         }
     }
     for (var phoneInput of phoneInputs) {