diff --git a/azurerm/resource_arm_security_center_contact.go b/azurerm/resource_arm_security_center_contact.go
index 14706b7f2a87..ec8c3bbbae95 100644
--- a/azurerm/resource_arm_security_center_contact.go
+++ b/azurerm/resource_arm_security_center_contact.go
@@ -38,7 +38,7 @@ func resourceArmSecurityCenterContact() *schema.Resource {
 
 			"phone": {
 				Type:         schema.TypeString,
-				Required:     true,
+				Optional:     true,
 				ValidateFunc: validate.NoEmptyStrings,
 			},
 
diff --git a/azurerm/resource_arm_security_center_contact_test.go b/azurerm/resource_arm_security_center_contact_test.go
index 64596917d6bd..893a9e086a9c 100644
--- a/azurerm/resource_arm_security_center_contact_test.go
+++ b/azurerm/resource_arm_security_center_contact_test.go
@@ -16,6 +16,7 @@ func TestAccAzureRMSecurityCenter_contact(t *testing.T) {
 			"basic":          testAccAzureRMSecurityCenterContact_basic,
 			"update":         testAccAzureRMSecurityCenterContact_update,
 			"requiresImport": testAccAzureRMSecurityCenterContact_requiresImport,
+			"phoneOptional":  testAccAzureRMSecurityCenterContact_phoneOptional,
 		},
 	}
 
@@ -127,6 +128,33 @@ func testAccAzureRMSecurityCenterContact_update(t *testing.T) {
 	})
 }
 
+func testAccAzureRMSecurityCenterContact_phoneOptional(t *testing.T) {
+	resourceName := "azurerm_security_center_contact.test"
+
+	resource.Test(t, resource.TestCase{
+		PreCheck:     func() { testAccPreCheck(t) },
+		Providers:    testAccProviders,
+		CheckDestroy: testCheckAzureRMSecurityCenterContactDestroy,
+		Steps: []resource.TestStep{
+			{
+				Config: testAccAzureRMSecurityCenterContact_templateWithoutPhone("basic@example.com", true, true),
+				Check: resource.ComposeTestCheckFunc(
+					testCheckAzureRMSecurityCenterContactExists(resourceName),
+					resource.TestCheckResourceAttr(resourceName, "email", "basic@example.com"),
+					resource.TestCheckResourceAttr(resourceName, "phone", ""),
+					resource.TestCheckResourceAttr(resourceName, "alert_notifications", "true"),
+					resource.TestCheckResourceAttr(resourceName, "alerts_to_admins", "true"),
+				),
+			},
+			{
+				ResourceName:      resourceName,
+				ImportState:       true,
+				ImportStateVerify: true,
+			},
+		},
+	})
+}
+
 func testCheckAzureRMSecurityCenterContactExists(resourceName string) resource.TestCheckFunc {
 	return func(s *terraform.State) error {
 		client := testAccProvider.Meta().(*ArmClient).securityCenter.ContactsClient
@@ -183,6 +211,17 @@ resource "azurerm_security_center_contact" "test" {
 `, email, phone, notifications, adminAlerts)
 }
 
+func testAccAzureRMSecurityCenterContact_templateWithoutPhone(email string, notifications, adminAlerts bool) string {
+	return fmt.Sprintf(`
+resource "azurerm_security_center_contact" "test" {
+  email = "%s"
+
+  alert_notifications = %t
+  alerts_to_admins    = %t
+}
+`, email, notifications, adminAlerts)
+}
+
 func testAccAzureRMSecurityCenterContact_requiresImportCfg(email, phone string, notifications, adminAlerts bool) string {
 	return fmt.Sprintf(`
 %s
diff --git a/website/docs/r/security_center_contact.markdown b/website/docs/r/security_center_contact.markdown
index 5de33d8da632..26b129967147 100644
--- a/website/docs/r/security_center_contact.markdown
+++ b/website/docs/r/security_center_contact.markdown
@@ -29,7 +29,7 @@ resource "azurerm_security_center_contact" "example" {
 The following arguments are supported:
 
 * `email` - (Required) The email of the Security Center Contact.
-* `phone` - (Required) The phone number of the Security Center Contact.
+* `phone` - (Optional) The phone number of the Security Center Contact.
 * `alert_notifications` - (Required) Whether to send security alerts notifications to the security contact.
 * `alerts_to_admins` - (Required) Whether to send security alerts notifications to subscription admins.