Japanese Phone Number Format Checker
Checks if input conforms to Japanese phone number formats.
日本の電話番号チェッカー
日本の電話番号を入力して形式を確認します。ハイフンは任意です。一般的な形式：
- 携帯電話: 090-xxxx-xxxx, 070-xxxx-xxxx (11桁)
- IP電話: 050-xxxx-xxxx (11桁)
- 固定電話 (東京): 03-xxxx-xxxx (10桁)
- 固定電話 (大阪): 06-xxxx-xxxx (10桁)
- フリーダイヤル: 0120-xxx-xxx (10桁)
- ナビダイヤル: 0570-xxx-xxx (10桁)
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