diff --git a/addons/project_sms/models/project_project.py b/addons/project_sms/models/project_project.py
index 27e21368b75..8c3de1bf602 100644
--- a/addons/project_sms/models/project_project.py
+++ b/addons/project_sms/models/project_project.py
@@ -13,7 +13,6 @@ class ProjectProject(models.Model):
                 project._message_sms_with_template(
                     template=project.stage_id.sms_template_id,
                     partner_ids=project.partner_id.ids,
-                    sms_numbers=project.partner_id.mapped('mobile'),
                 )
 
     @api.model_create_multi
diff --git a/addons/project_sms/models/project_task.py b/addons/project_sms/models/project_task.py
index d65bc4d9614..a40e69ba4e0 100644
--- a/addons/project_sms/models/project_task.py
+++ b/addons/project_sms/models/project_task.py
@@ -13,7 +13,6 @@ class ProjectTask(models.Model):
                 task._message_sms_with_template(
                     template=task.stage_id.sms_template_id,
                     partner_ids=task.partner_id.ids,
-                    sms_numbers=task.partner_id.mapped('mobile'),
                 )
 
     @api.model_create_multi
diff --git a/addons/project_sms/tests/test_project_sharing.py b/addons/project_sms/tests/test_project_sharing.py
index 45d456e937b..c53f125f524 100644
--- a/addons/project_sms/tests/test_project_sharing.py
+++ b/addons/project_sms/tests/test_project_sharing.py
@@ -44,7 +44,18 @@ class TestProjectSharingWithSms(TestProjectSharingCommon, SMSCommon):
                 'stage_id': self.task_stage_with_sms.id,
             })
         self.assertEqual(self.task_portal.stage_id, self.task_stage_with_sms)
-        self.assertSMSIapSent([self.task_portal.partner_id.mobile])
+        self.assertSMSIapSent([])  # no sms sent since the author is the recipient
+
+        self.task_portal.write({
+            'partner_id': self.user_projectuser.partner_id.id,
+            'stage_id': self.project_portal.type_ids[0].id,
+        })
+        with self.mockSMSGateway():
+            self.task_portal.with_user(self.user_portal).write({
+                'stage_id': self.task_stage_with_sms.id,
+            })
+        self.assertEqual(self.task_portal.stage_id, self.task_stage_with_sms)
+        self.assertSMSIapSent([self.user_projectuser.partner_id.mobile])
 
         with self.mockSMSGateway():
             self.project_portal.write({