diff --git a/helpers.js b/helpers.js
index 8a2e1b9..cc2fa45 100644
--- a/helpers.js
+++ b/helpers.js
@@ -44,4 +44,11 @@ function isValidEmail(email) {
   function getRandomBoolean() {
     return Math.random() < 0.5;
   }
-  
\ No newline at end of file
+  
+  /* -------------------------------------------------------------------------- */
+/*                          check valid phone number                         */
+/* -------------------------------------------------------------------------- */
+function validateMobileNumber(mobileNumber) {
+  var pattern = /^\d{10}$/;
+  return pattern.test(mobileNumber);
+}
\ No newline at end of file