diff --git a/api/models.py b/api/models.py
index 5da0fdc..d934133 100644
--- a/api/models.py
+++ b/api/models.py
@@ -11,7 +11,7 @@ from django.utils import timezone
 class User(AbstractUser):
     email = models.EmailField(unique=True, blank=True, null=True)
     address = models.CharField(max_length=255, blank=True)
-    mobile = models.CharField(max_length=255, blank=True)
+    mobile = models.CharField(max_length=255, blank=True, unique=True, null=True)
     designation = models.CharField(max_length=255, blank=True)
     acc_no = models.CharField(max_length=255, blank=True)
     id_card = models.CharField(max_length=255, blank=True)