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
new file mode 100644
index 0000000..44d92a0
--- /dev/null
+++ b/backend/app/plugins/wiaas/includes/admin/class-wiaas-admin-user-profile.php
@@ -0,0 +1,31 @@
+<?php
+
+class Wiaas_Admin_Profile {
+
+    public static function init() {
+        add_filter( 'user_contactmethods', array(__CLASS__, 'modify_user_contact_methods') );
+
+        add_action( 'user_profile_update_errors', array(__CLASS__, 'crf_user_profile_update_errors'), 10, 3 );
+
+    }
+
+    public static function crf_user_profile_update_errors( $errors, $update, $user ) {
+
+        $phone = $_POST['phone'];
+
+        if (!Wiaas_Validation::is_phone($phone)){
+            $errors->add('phone_error', __( '<strong>ERROR</strong>: Enter valid phone number.', 'crf' ));
+        };
+
+    }
+
+    public static function modify_user_contact_methods($user_contact){
+        $user_contact['phone'] = __( 'Phone number' );
+
+        return $user_contact;
+    }
+
+
+}
+
+Wiaas_Admin_Profile::init();
\ No newline at end of file
diff --git a/backend/app/plugins/wiaas/includes/api/class-wiaas-rest-customer.php b/backend/app/plugins/wiaas/includes/api/class-wiaas-rest-customer.php
index 79bffe7..2c57629 100644
--- a/backend/app/plugins/wiaas/includes/api/class-wiaas-rest-customer.php
+++ b/backend/app/plugins/wiaas/includes/api/class-wiaas-rest-customer.php
@@ -148,6 +148,10 @@ class Wiaas_REST_Customer_API {
 			return wiaas_api_notice('ADD_PHONE_NUMBER', 'error', Wiaas_Customer::get_customer_info($customer_id));
 		}
 
+        if (!Wiaas_Validation::is_phone($phone)){
+            return wiaas_api_notice('INVALID_PHONE_NUMBER', 'error', Wiaas_Customer::get_customer_info($customer_id));
+        };
+
 		if (!Wiaas_Customer::update_customer_profile_info($customer_id, $first_name, $last_name, $phone)){
 			return wiaas_api_notice('PROFILE_NOT_CHANGED', 'warning', Wiaas_Customer::get_customer_info($customer_id));
 		}
diff --git a/backend/app/plugins/wiaas/includes/class-wiaas-admin.php b/backend/app/plugins/wiaas/includes/class-wiaas-admin.php
index 6d5021e..5c5ef1f 100644
--- a/backend/app/plugins/wiaas/includes/class-wiaas-admin.php
+++ b/backend/app/plugins/wiaas/includes/class-wiaas-admin.php
@@ -28,6 +28,8 @@ class Wiaas_Admin {
 
         require_once dirname(__FILE__) . '/admin/class-wiaas-admin-supplier.php';
 
+        require_once dirname(__FILE__) . '/admin/class-wiaas-admin-user-profile.php';
+
         add_action( 'admin_enqueue_scripts', array(__CLASS__, 'enqueue_scripts'), 100 );
 	}
 
diff --git a/backend/app/plugins/wiaas/includes/class-wiaas-validation.php b/backend/app/plugins/wiaas/includes/class-wiaas-validation.php
new file mode 100644
index 0000000..e9771c2
--- /dev/null
+++ b/backend/app/plugins/wiaas/includes/class-wiaas-validation.php
@@ -0,0 +1,13 @@
+<?php
+
+defined( 'ABSPATH' ) || exit;
+
+/**
+ * Class Wiaas_Validation
+ */
+class Wiaas_Validation {
+
+    public static function is_phone($phone){
+        return WC_Validation::is_phone($phone);
+    }
+}
diff --git a/backend/app/plugins/wiaas/wiaas.php b/backend/app/plugins/wiaas/wiaas.php
index 5bafd13..582e624 100644
--- a/backend/app/plugins/wiaas/wiaas.php
+++ b/backend/app/plugins/wiaas/wiaas.php
@@ -59,6 +59,8 @@ include_once WIAAS_DIR . '/includes/class-wiass-templates.php';
 
 include_once WIAAS_DIR . '/includes/wiaas-class-measurement-units.php';
 
+include_once WIAAS_DIR . '/includes/class-wiaas-validation.php';
+
 function wiaas_redirect_to_login() {
     wp_safe_redirect(get_site_url('', 'wp-login.php'));
 }