diff --git a/core/modules/telephone/src/Plugin/Field/FieldType/TelephoneItem.php b/core/modules/telephone/src/Plugin/Field/FieldType/TelephoneItem.php
index f2aa1ccdde..38a94463cc 100644
--- a/core/modules/telephone/src/Plugin/Field/FieldType/TelephoneItem.php
+++ b/core/modules/telephone/src/Plugin/Field/FieldType/TelephoneItem.php
@@ -61,13 +61,16 @@ public function getConstraints() {
     $constraint_manager = \Drupal::typedDataManager()->getValidationConstraintManager();
     $constraints = parent::getConstraints();
 
+    $min_length = 6;
     $max_length = 256;
     $constraints[] = $constraint_manager->create('ComplexData', [
       'value' => [
         'Length' => [
+          'min' => $min_length,
+          'minMessage' => t('%name: the telephone number may not be shorter than @min characters.', array('%name' => $this->getFieldDefinition()->getLabel(), '@min' => $min_length)),
           'max' => $max_length,
           'maxMessage' => t('%name: the telephone number may not be longer than @max characters.', ['%name' => $this->getFieldDefinition()->getLabel(), '@max' => $max_length]),
-        ]
+        ],
       ],
     ]);