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3HK自动保号: 1️⃣首页附加服务选择并购买「留言信箱服務」。
2️⃣在首页「已購入之組合」里，勾选自动续费，然后点击「訂閱設定」。
3️⃣开启自动转账绑定一张信用卡即可。
按描述，此服务会在留言信箱到期前7天自动往3HK储值卡增值差价，届时会自动续费30天留言信箱以实现自动保号功能。
3HK自动保号:
