diff --git a/core/modules/telephone/config/schema/telephone.schema.yml b/core/modules/telephone/config/schema/telephone.schema.yml
index 3baefe3..0bb2d50 100644
--- a/core/modules/telephone/config/schema/telephone.schema.yml
+++ b/core/modules/telephone/config/schema/telephone.schema.yml
@@ -6,14 +6,6 @@ field.telephone.settings:
   sequence:
     - type: string
 
-field.telephone.instance_settings:
-  type: mapping
-  label: 'Telephone number settings'
-  mapping:
-    user_register_form:
-      type: boolean
-      label: 'Display on user registration form.'
-
 field.telephone.value:
   type: sequence
   label: 'Default value'