diff --git a/regexp.go b/regexp.go
index aa02bd5..f38409d 100644
--- a/regexp.go
+++ b/regexp.go
@@ -29,9 +29,9 @@ func IsMail(val string) bool {
 
 func IsPhone(val string) bool {
 	if strings.HasPrefix(val, "+") {
-		return IsMatch(val[1:], `\d{13}`)
+		return IsMatch(val[1:], `^\d{13}$`)
 	} else {
-		return IsMatch(val, `\d{11}`)
+		return IsMatch(val, `^\d{11}$`)
 	}
 }
 
diff --git a/regexp_test.go b/regexp_test.go
index e983eba..977737d 100644
--- a/regexp_test.go
+++ b/regexp_test.go
@@ -51,3 +51,11 @@ func TestIsPhone3(t *testing.T) {
 		t.Errorf("TestIsPhone3:\n Expect => %v\n Got    => %v\n", expect, got)
 	}
 }
+
+func TestIsPhone4(t *testing.T) {
+	got := IsPhone("186121855232342342")
+	expect := false
+	if got != expect {
+		t.Errorf("TestIsPhone4:\n Expect => %v\n Got    => %v\n", expect, got)
+	}
+}