diff --git a/core/modules/telephone/config/schema/telephone.schema.yml b/core/modules/telephone/config/schema/telephone.schema.yml
new file mode 100644
index 0000000..7411f78
--- /dev/null
+++ b/core/modules/telephone/config/schema/telephone.schema.yml
@@ -0,0 +1,34 @@
+# Schema for the configuration files of the Telephone module.
+
+field.telephone.settings:
+  type: sequence
+  label: 'Telephone number 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'
+  sequence:
+    - type: mapping
+      label: 'Default'
+      mapping:
+        value:
+          type: string
+          label: 'Value'
+
+field_widget.telephone_default.settings:
+  type: mapping
+  label: 'telephone number widget settings'
+  mapping:
+    placeholder:
+      type: label
+      label: 'Placeholder'