diff --git a/phonenumberutil_test.go b/phonenumberutil_test.go
index af353c9..b2c0780 100644
--- a/phonenumberutil_test.go
+++ b/phonenumberutil_test.go
@@ -261,6 +261,11 @@ func Test_IsValidNumber(t *testing.T) {
 			err:     nil,
 			isValid: true,
 			region:  "CN",
+		}, {
+			input:   "+8617910517228",
+			err:     nil,
+			isValid: true,
+			region:  "CN",
 		},
 	}