Django Admin won't work after i changed AUTH_USER_MODEL - django

Question

I am trying to make a small authentication app using django, the admin page
won't work any more, the problem happened after i changed the AUTH_USER_MODEL inside settings.py , now if i typed python manage.py createsuperuser it gives me different fields than it was before, more than that, if i tried to access the admin page, it asks for my phone number as login not username.
Also inside database i can't see any tables that belongs to auth_user, in fact, i did the migration but its just recognizing Client model but not Admin model.
Is there any way to make both of my models work ??
Here are my codes:
settings.py
AUTH_USER_MODEL = 'authiz.Client'
AUTHENTICATION_BACKENDS = (
'django.contrib.auth.backends.ModelBackend',
'authiz.models.Client',
)
# Login settings
LOGIN_URL = 'login'
LOGOUT_URL = 'index'
LOGIN_REDIRECT_URL = 'profile'
models.py
class Client(AbstractBaseUser, PermissionsMixin):
email = models.EmailField(null=True, blank=True, unique=True)
phone = models.CharField(max_length=18,unique=True)
joined = models.DateTimeField(auto_now_add=True)
first_name = models.CharField(max_length=200, null=True, blank=True)
last_name = models.CharField(max_length=200, null=True, blank=True)
is_staff = models.BooleanField(default=False)
password = models.CharField(default='', null=False, max_length=255)
USERNAME_FIELD = 'phone'
objects = UserManager()
def get_username(self):
return self.first_name
def get_short_name(self):
return self.last_name
def __str__(self):
return self.phone
def natural_key(self):
return (self.get_username(),)
def set_password(self, raw_password):
self.password = make_password(raw_password)
def check_password(self, raw_password):
def setter(raw_password):
self.set_password(raw_password)
self.save(update_fields=["password"])
return check_password(raw_password, self.password, setter)
def set_unusable_password(self):
self.password = make_password(None)
def has_usable_password(self):
return is_password_usable(self.password)
def is_superuser(self):
return False
def is_admin(self):
return False