diff --git a/Client-Side Components/Client Scripts/validate phone number/Readme.md b/Client-Side Components/Client Scripts/validate phone number/Readme.md
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+Phone Number Validation — Client Script (ServiceNow)
+Overview
+
+This Client Script ensures that users enter their phone numbers in a strict format: (123) 456-7890.
+It is triggered whenever the Phone field changes and validates the input in real time.
+
+If the input does not match the required format, the script:
+
+Clears the invalid value.
+
+Displays a field-level error message directly below the field.
+
+Provides a fallback alert if field-level messaging is unavailable.
+
+This script is designed to be user-friendly, dynamic, and failsafe.
+
+Features
+
+Validates phone numbers in the format (123) 456-7890.
+
+Inline error messages appear directly below the field, avoiding top-of-page clutter.
+
+Clears invalid input to prevent incorrect data submission.
+
+Works dynamically for any phone field with minimal configuration.
+
+Provides fallback alert for environments where inline messages are unavailable.
+
+Usage Instructions
+1. Create the Client Script
+
+Navigate to System Definition → Client Scripts.
+
+Click New to create a client script.
+
+2. Configure the Script
+
+Name: Phone Number Validation
+
+Table: sys_user 
+
+Type: onChange
+
+Field: phone
+
+Active: Checked
diff --git a/Client-Side Components/Client Scripts/validate phone number/Validate PhoneNumber.js b/Client-Side Components/Client Scripts/validate phone number/Validate PhoneNumber.js
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+++ b/Client-Side Components/Client Scripts/validate phone number/Validate PhoneNumber.js	
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+function onChange(control, oldValue, newValue, isLoading) {
+    if (isLoading || !newValue) return;
+
+    var fieldName = control.name;
+    var fieldLabel = g_form.getLabelOf ? g_form.getLabelOf(fieldName) : fieldName;
+
+    // --- Phone format: (123) 456-7890 ---
+    var phonePattern = /^\(\d{3}\) \d{3}-\d{4}$/;
+
+    // Clear any existing field messages
+    if (g_form.hideFieldMsg) g_form.hideFieldMsg(fieldName, true);
+
+    // Validate the phone number
+    if (!phonePattern.test(newValue)) {
+        // Reset invalid input
+        if (g_form.setValue) {
+            g_form.setValue(fieldName, '');
+        } else {
+            control.value = '';
+        }
+
+        // Show a clear inline message below the field
+        if (g_form.showFieldMsg) {
+            g_form.showFieldMsg(
+                fieldName,
+                'Phone Number must be in the format (123) 456-7890',
+                'error',
+                false // false = show below the field
+            );
+        } else {
+            alert(fieldLabel + ' must be in the format (123) 456-7890');
+        }
+    }
+}