diff --git a/addons/crm/tests/test_crm_lead.py b/addons/crm/tests/test_crm_lead.py
index ebf64312175..1ab197bc917 100644
--- a/addons/crm/tests/test_crm_lead.py
+++ b/addons/crm/tests/test_crm_lead.py
@@ -368,8 +368,10 @@ class TestCRMLead(TestCrmCommon):
         self.assertFalse(lead.mobile)
         self.assertFalse(lead.phone_sanitized)
         self.assertEqual(partner.mobile, partner_mobile)
-        self.assertEqual(partner.phone_sanitized, partner_mobile_sanitized,
-                         'Partner sanitized should be computed on mobile')
+        # if SMS is uninstalled, phone_sanitized is not available on partner
+        if 'phone_sanitized' in partner:
+            self.assertEqual(partner.phone_sanitized, partner_mobile_sanitized,
+                             'Partner sanitized should be computed on mobile')
 
     @users('user_sales_manager')
     def test_crm_lead_partner_sync_email_phone_corner_cases(self):
diff --git a/addons/phone_validation/models/res_partner.py b/addons/phone_validation/models/res_partner.py
index 99f1ff13cf4..2f98353e21e 100644
--- a/addons/phone_validation/models/res_partner.py
+++ b/addons/phone_validation/models/res_partner.py
@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
 # Part of Odoo. See LICENSE file for full copyright and licensing details.
 
 from odoo import api, models
@@ -30,3 +29,16 @@ class Partner(models.Model):
             force_format='INTERNATIONAL',
             raise_exception=False
         )
+
+    def phone_get_sanitized_number(self, number_fname='mobile', force_format='E164'):
+        """ Stand alone version, allowing to use it on partner model without
+        having any dependency on sms module. To cleanup in master (15.3 +)."""
+        self.ensure_one()
+        country_fname = 'country_id'
+        number = self[number_fname]
+        return phone_validation.phone_sanitize_numbers_w_record([number], self, record_country_fname=country_fname, force_format=force_format)[number]['sanitized']
+
+    def _phone_get_number_fields(self):
+        """ Stand alone version, allowing to use it on partner model without
+        having any dependency on sms module. To cleanup in master (15.3 +)."""
+        return ['mobile', 'phone']
diff --git a/addons/sms/models/res_partner.py b/addons/sms/models/res_partner.py
index f1f63b85561..3215fa66832 100644
--- a/addons/sms/models/res_partner.py
+++ b/addons/sms/models/res_partner.py
@@ -6,7 +6,7 @@ from odoo import models
 
 class ResPartner(models.Model):
     _name = 'res.partner'
-    _inherit = ['res.partner', 'mail.thread.phone']
+    _inherit = ['mail.thread.phone', 'res.partner']
 
     def _sms_get_default_partners(self):
         """ Override of mail.thread method.