diff --git a/backend/app/plugins/wiaas/includes/admin/class-wiaas-admin-user-profile.php b/backend/app/plugins/wiaas/includes/admin/class-wiaas-admin-user-profile.php
index a4b6d1a..ba5b7b5 100644
--- a/backend/app/plugins/wiaas/includes/admin/class-wiaas-admin-user-profile.php
+++ b/backend/app/plugins/wiaas/includes/admin/class-wiaas-admin-user-profile.php
@@ -9,18 +9,17 @@ class Wiaas_Admin_Profile {
 
     }
 
-    function crf_user_profile_update_errors( $errors, $update, $user ) {
+    public static function crf_user_profile_update_errors( $errors, $update, $user ) {
 
         $phone = $_POST['phone'];
 
-        if (!preg_match('/^[\d +]*$/', $phone)){
+        if (!WC_Validation::is_phone($phone)){
             $errors->add('phone_error', __( '<strong>ERROR</strong>: Enter valid phone number.', 'crf' ));
         };
 
     }
 
-
-    function modify_user_contact_methods($user_contact){
+    public static function modify_user_contact_methods($user_contact){
         $user_contact['phone'] = __( 'Phone number' );
 
         return $user_contact;
diff --git a/backend/app/plugins/wiaas/includes/api/class-wiaas-rest-customer.php b/backend/app/plugins/wiaas/includes/api/class-wiaas-rest-customer.php
index c040a2d..0507578 100644
--- a/backend/app/plugins/wiaas/includes/api/class-wiaas-rest-customer.php
+++ b/backend/app/plugins/wiaas/includes/api/class-wiaas-rest-customer.php
@@ -148,7 +148,7 @@ class Wiaas_REST_Customer_API {
 			return wiaas_api_notice('ADD_PHONE_NUMBER', 'error', Wiaas_Customer::get_customer_info($customer_id));
 		}
 
-        if (!preg_match('/^[\d +]*$/', $phone)){
+        if (!WC_Validation::is_phone($phone)){
             return wiaas_api_notice('INVALID_PHONE_NUMBER', 'error', Wiaas_Customer::get_customer_info($customer_id));
         };