diff --git a/addons/crm/tests/test_crm_lead.py b/addons/crm/tests/test_crm_lead.py
index 109ddefdd20..082d7642af6 100644
--- a/addons/crm/tests/test_crm_lead.py
+++ b/addons/crm/tests/test_crm_lead.py
@@ -537,3 +537,9 @@ class TestCRMLead(TestCrmCommon):
         self.assertEqual(lead.phone, self.test_phone_data[1])
         self.assertEqual(lead.mobile, self.test_phone_data[2])
         self.assertEqual(lead.phone_sanitized, self.test_phone_data_sanitized[2])
+
+        # updating country should trigger sanitize computation
+        lead.write({'country_id': self.env.ref('base.be').id})
+        self.assertEqual(lead.phone, self.test_phone_data[1])
+        self.assertEqual(lead.mobile, self.test_phone_data[2])
+        self.assertFalse(lead.phone_sanitized)
diff --git a/addons/crm_sms/tests/test_crm_lead.py b/addons/crm_sms/tests/test_crm_lead.py
index f5659da8301..2ea9a073363 100644
--- a/addons/crm_sms/tests/test_crm_lead.py
+++ b/addons/crm_sms/tests/test_crm_lead.py
@@ -2,7 +2,7 @@
 # Part of Odoo. See LICENSE file for full copyright and licensing details.
 
 from odoo.addons.crm.tests.common import TestCrmCommon
-from odoo.tests.common import Form, users
+from odoo.tests.common import users
 
 
 class TestCRMLead(TestCrmCommon):
diff --git a/addons/phone_validation/models/mail_thread_phone.py b/addons/phone_validation/models/mail_thread_phone.py
index 44ad7d8bdd1..5d844b0aa96 100644
--- a/addons/phone_validation/models/mail_thread_phone.py
+++ b/addons/phone_validation/models/mail_thread_phone.py
@@ -92,7 +92,7 @@ class PhoneMixin(models.AbstractModel):
             return [(0, '=', 1)]
         return [('id', 'in', [r[0] for r in res])]
 
-    @api.depends(lambda self: self._phone_get_number_fields())
+    @api.depends(lambda self: self._phone_get_sanitize_triggers())
     def _compute_phone_sanitized(self):
         self._assert_phone_field()
         number_fields = self._phone_get_number_fields()
@@ -162,6 +162,11 @@ class PhoneMixin(models.AbstractModel):
         if not any(fname in self and self._fields[fname].type == 'char' for fname in self._phone_get_number_fields()):
             raise UserError(_('Invalid primary phone field on model %s', self._name))
 
+    def _phone_get_sanitize_triggers(self):
+        """ Tool method to get all triggers for sanitize """
+        res = [self._phone_get_country_field()] if self._phone_get_country_field() else []
+        return res + self._phone_get_number_fields()
+
     def _phone_get_number_fields(self):
         """ This method returns the fields to use to find the number to use to
         send an SMS on a record. """