Add PhoneNumberFormat for ja_JP.

src/Faker/Provider/ja_JP/PhoneNumber.php

@@ -4,9 +4,16 @@
 
 class PhoneNumber extends \Faker\Provider\PhoneNumber
 {
+    /**
+     * @link http://www.soumu.go.jp/main_sosiki/joho_tsusin/top/tel_number/number_shitei.html#kotei-denwa
+     */
     protected static $formats = array(
         '080-####-####',
         '090-####-####',
-        '##-####-####'
+        '0#-####-####',
+        '0####-#-####',
+        '0###-##-####',
+        '0##-###-####',
+        '0##0-###-###',
     );
 }

test/Faker/Provider/ja_JP/PhoneNumberTest.php

@@ -0,0 +1,21 @@
+<?php
+
+namespace Faker\Test\Provider\ja_JP;
+
+use Faker\Generator;
+use Faker\Provider\ja_JP\PhoneNumber;
+
+class PhoneNumberTest extends \PHPUnit_Framework_TestCase
+{
+    public function testPhoneNumber()
+    {
+        $faker = new Generator();
+        $faker->addProvider(new PhoneNumber($faker));
+
+        for ($i = 0; $i < 10; $i++) {
+            $phoneNumber = $faker->phoneNumber;
+            $this->assertNotEmpty($phoneNumber);
+            $this->assertRegExp('/^0\d{1,4}-\d{1,4}-\d{3,4}$/', $phoneNumber);
+        }
+    }
+}