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<div class="answer-box mb-4">
    <div class="answer-label">Quick answer</div>
    <p class="answer-text">Yes — WhatsApp works in Japan. You need a data connection (eSIM, SIM card, or Wi-Fi) and must complete phone number verification <em>before</em> you arrive.</p>
  </div>

<p class="mb-3">Got a trip to Japan on the horizon? Don't let the fear of being disconnected from your friends and family ruin the excitement!</p>
 <p class="mb-3">
A solid internet connection is a must-have for your stay. Whether you are leaning toward sharing <a href="https://rental.cdjapan.co.jp/index_en_jpy_7.html" class="text-decoration-none"></a>a Pocket Wi-Fi</a> with your travel buddies or grabbing a super-convenient  <a href="https://prepaidsim.cdjapan.co.jp/eSIM/" class="text-decoration-none">eSIM</a>, picking the right one can be tricky.</p>
 <p class="mb-3">
That’s why we’ve put together this ultimate guide to solve your tech worries. We’ll cover the basics like using WhatsApp on a local eSIM, data consumption, and what to set up before you board your flight—along with a quick look at LINE, the messaging app that locals love.</p>

<div class="mb-5">
    <h2 class="section-title">How WhatsApp Works in Japan</h2>

<p>WhatsApp runs on internet data, not your phone's calling or SMS service. That means it works on any data connection — a Japanese eSIM, a local SIM card, or a Wi-Fi network — regardless of which country you're in.</p>

<p>When you first set up WhatsApp, it ties your account to your phone number using a one-time SMS verification. That verification only happens once. After that, all your messages and calls travel over the internet (VoIP), not through phone lines. So switching to a Japanese data-only eSIM has no effect on your WhatsApp account — your number stays the same, your contacts stay the same, your chat history stays the same.</p>

<div class="info-box-green mb-4">
      <strong>✅ In short:</strong> As long as WhatsApp is set up and verified on your phone before you leave home, you can switch to a Japanese data-only eSIM and use WhatsApp exactly as you do today. No re-authentication required.
    </div>

<h3 class="fw-semibold mb-2 mt-4" style="font-size:1.05rem;">One thing to do before you leave: verify WhatsApp at home</h3>
    <p>WhatsApp's SMS verification requires a number that can receive text messages. Most Japanese travel eSIMs are data-only and do not support SMS. If you try to set up or re-verify WhatsApp after switching to a Japanese eSIM, it won't work.</p>

<div class="info-box mb-3">
      <strong>⚠️ Do this before departure:</strong> Make sure WhatsApp is installed and your phone number verification is complete on your home SIM. Once you're in Japan on a data-only eSIM, verification is not possible.
    </div>

<h3 class="fw-semibold mb-2 mt-4" style="font-size:1.05rem;">What you can and can't do with WhatsApp on a Japanese eSIM</h3>
    <div class="cj-table-wrap mb-3">
      <table class="table cj-table mb-0">
        <thead>
          <tr><th>Feature</th><th>Works on data-only eSIM?</th><th>Notes</th></tr>
        </thead>
        <tbody>
          <tr>
            <td>Text messages</td>
            <td><span class="tag-yes">✓ Yes</span></td>
            <td>Uses barely any data (~1 KB/message)</td>
          </tr>
          <tr>
            <td>Voice calls</td>
            <td><span class="tag-yes">✓ Yes</span></td>
            <td>Free between WhatsApp users</td>
          </tr>
          <tr>
            <td>Video calls</td>
            <td><span class="tag-yes">✓ Yes</span></td>
            <td>Uses more data — see table below</td>
          </tr>
          <tr>
            <td>Photo & video sharing</td>
            <td><span class="tag-yes">✓ Yes</span></td>
            <td>File size varies</td>
          </tr>
          <tr>
            <td>Receiving calls</td>
            <td><span class="tag-yes">✓ Yes</span></td>
            <td>Works as long as you have internet</td>
          </tr>
          <tr>
            <td>SMS verification / account setup</td>
            <td><span class="tag-no">✗ No</span></td>
            <td>Requires SMS-capable SIM — do this before departure</td>
          </tr>
          <tr>
            <td>Calling standard phone numbers</td>
            <td><span class="tag-no">✗ No</span></td>
            <td>WhatsApp can't call regular landlines or mobiles directly</td>
          </tr>
        </tbody>
      </table>
    </div>
  </div>

<div class="mb-5">
    <h2 class="section-title">WhatsApp Data Usage: How Much Do You Need?</h2>

<p>WhatsApp is one of the most data-efficient communication apps available. Text messages use almost nothing. Even long voice calls are far lighter than streaming a video. Here's the breakdown:</p>

<h3 class="fw-semibold mb-3 mt-3" style="font-size:1.05rem;">Data usage per feature</h3>
    <div class="cj-table-wrap mb-4">
      <table class="table cj-table mb-0">
        <thead>
          <tr><th>Feature</th><th>Data usage</th><th>Notes</th></tr>
        </thead>
        <tbody>
          <tr>
            <td>Text messages</td>
            <td>~1 KB / message</td>
            <td>Hundreds of messages = negligible impact</td>
          </tr>
          <tr>
            <td>Voice calls</td>
            <td>0.15–0.5 MB / min</td>
            <td>Light; stable even on weaker signals</td>
          </tr>
          <tr>
            <td>Video calls</td>
            <td>3–6 MB / min</td>
            <td>Higher on HD settings</td>
          </tr>
          <tr>
            <td>Photos shared</td>
            <td>50–500 KB / image</td>
            <td>Depends on resolution</td>
          </tr>
          <tr>
            <td>Videos shared</td>
            <td>500 KB–2 MB / min</td>
            <td>Compressed by WhatsApp before sending</td>
          </tr>
          <tr>
            <td>Background (app idle)</td>
            <td>~1 KB / 24 hrs</td>
            <td>Effectively zero</td>
          </tr>
        </tbody>
      </table>
    </div>

<h3 class="fw-semibold mb-3" style="font-size:1.05rem;">How much data for a 1-hour video call?</h3>
    <div class="cj-table-wrap mb-4">
      <table class="table cj-table mb-0">
        <thead>
          <tr><th>Call type</th><th>1 hour of usage</th></tr>
        </thead>
        <tbody>
          <tr><td>Voice call</td><td>9–30 MB</td></tr>
          <tr><td>Video call (standard)</td><td>180–360 MB</td></tr>
        </tbody>
      </table>
    </div>

<div class="info-box-blue mb-3">
      <strong>Planning daily video calls?</strong> Budget at least 400 MB per day for WhatsApp video. A 30 GB plan covers 75+ days of daily 1-hour video calls alongside normal browsing — more than enough for most trips.
    </div>

<h3 class="fw-semibold mb-3 mt-4" style="font-size:1.05rem;">Recommended plans for WhatsApp-heavy travelers</h3>
    <div class="cj-table-wrap">
      <table class="table cj-table mb-0">
        <thead>
          <tr><th>Plan</th><th>Data</th><th>Days</th><th>Price</th><th>Best for</th></tr>
        </thead>
        <tbody>
          <tr>
            <td>Japan eSIM</td><td>30 GB</td><td>8 days</td>
            <td><a href="https://prepaidsim.cdjapan.co.jp/eSIM/checkout.php?id=1013" class="fw-bold">¥3,200 →</a></td>
            <td>Short trips with moderate calls</td>
          </tr>
          <tr>
            <td>Japan eSIM Unlimited</td><td>Unlimited</td><td>10 days</td>
            <td><a href="https://prepaidsim.cdjapan.co.jp/eSIM/checkout.php?id=1263" class="fw-bold">¥5,000 →</a></td>
            <td>Daily video calls, hotspot sharing</td>
          </tr>
          <tr>
            <td>Japan eSIM</td><td>50 GB</td><td>16 days</td>
            <td><a href="https://prepaidsim.cdjapan.co.jp/eSIM/checkout.php?id=1014" class="fw-bold">¥3,900 →</a></td>
            <td>Two-week trips with frequent media sharing</td>
          </tr>
          <tr>
            <td>Japan eSIM Unlimited</td><td>Unlimited</td><td>31 days</td>
            <td><a href="https://prepaidsim.cdjapan.co.jp/eSIM/checkout.php?id=889" class="fw-bold">¥7,900 →</a></td>
            <td>Long stays, heavy daily usage</td>
          </tr>
        </tbody>
      </table>
    </div>
    <p class="mt-2" style="font-size:.9rem;color:#6c757d;">Unlimited plans: speeds throttled after 3 GB/day (standard industry FUP). Connection is never cut.</p>
  </div>

<div class="cta-box text-center mb-5">
    <div class="mb-2" style="font-size:1.5rem;">📱</div>
    <h3 class="fw-bold mb-2">Stay connected in Japan with CDJapan eSIM</h3>
    <p class="mb-4">docomo network — Japan's largest. Instant delivery, no airport queues.</p>
    <a href="https://prepaidsim.cdjapan.co.jp/eSIM/" class="btn btn-light">View all Japan eSIM plans →</a>
  </div>

<div class="mb-5">
    <h2 class="section-title">WhatsApp vs LINE: What Locals Actually Use</h2>

<p>WhatsApp is the go-to messaging app for most of the world, but Japan is different. The dominant messaging app in Japan is <strong>LINE</strong>, not WhatsApp. Understanding this before you arrive will save you a lot of confusion.</p>

<div class="row g-3 mb-4">
      <div class="col-md-6">
        <div class="app-card recommended">
          <span class="app-badge app-badge-blue">For staying in touch with home</span>
          <p class="app-name">WhatsApp</p>
          <p class="app-desc">Best for keeping in contact with friends and family in your home country. Most international travelers already have it, and it works seamlessly over any data connection in Japan — including a data-only eSIM. Free calls, video calls, and messaging worldwide.</p>
        </div>
      </div>
      <div class="col-md-6">
        <div class="app-card">
          <span class="app-badge app-badge-green">For connecting with locals</span>
          <p class="app-name">LINE</p>
          <p class="app-desc">The dominant messaging app in Japan. When Japanese people exchange contacts, they exchange LINE IDs. If you're meeting locals, joining tours, or working with Japanese vendors, you'll likely need LINE. Register before you arrive — LINE requires SMS verification, which a data-only eSIM cannot provide.</p>
        </div>
      </div>
    </div>

<div class="info-box mb-3">
      <strong>⚠️ Register LINE before departure too.</strong> Just like WhatsApp, LINE requires SMS verification during sign-up. A Japanese data-only eSIM cannot complete this step. If you want LINE for meeting locals, register it on your home SIM before you fly.
    </div>

<h3 class="fw-semibold mb-2 mt-4" style="font-size:1.05rem;">Other apps that work on a data-only eSIM in Japan</h3>
    <p>Any app that communicates over the internet works fine on a Japanese data-only eSIM: FaceTime, Telegram, Signal, Messenger, Google Meet, Zoom, Skype. The only limitation is SMS-based verification — if an app needs to send you a text message to confirm your number, you'll need to complete that step before switching to a data-only SIM.</p>
  </div>

<div class="mb-5">
    <h2 class="section-title">Frequently Asked Questions</h2>

<div class="faq-item">
      <h3>Do Japanese people use WhatsApp?</h3>
      <p class="mb-0">WhatsApp is not widely used in Japan. Most Japanese people use LINE for personal messaging. WhatsApp has very low adoption among local residents. If you're planning to communicate with locals — guides, restaurant staff, Airbnb hosts — expect them to use LINE, not WhatsApp.</p>
    </div>

<div class="faq-item">
      <h3>Can I use WhatsApp for free in Japan?</h3>
      <p class="mb-0">Yes. WhatsApp itself is free to use. Calls between WhatsApp users — whether domestic or international — are completely free. You will use mobile data, which comes from your eSIM or SIM plan. There are no additional charges from WhatsApp for calls or messages.</p>
    </div>

<div class="faq-item">
      <h3>Does WhatsApp work on a Japanese data-only eSIM?</h3>
      <p class="mb-0">Yes, fully. Messaging, voice calls, video calls, and media sharing all work on a data-only eSIM. The one exception is initial phone number verification — that requires SMS, which data-only eSIMs do not support. Complete verification at home before departure.</p>
    </div>

<div class="faq-item">
      <h3>Will my WhatsApp number change when I use a Japanese eSIM?</h3>
      <p class="mb-0">No. Your WhatsApp account is linked to your original phone number and stays tied to your device. Switching to a Japanese eSIM for data has no effect on your WhatsApp number, contacts, or chat history.</p>
    </div>

<div class="faq-item">
      <h3>Is WhatsApp banned or restricted in Japan?</h3>
      <p class="mb-0">No. WhatsApp is completely unrestricted in Japan. There are no government restrictions or blocks on WhatsApp, unlike in some other countries. You can use it freely over any internet connection.</p>
    </div>

<div class="faq-item">
      <h3>Can I use WhatsApp calls in Japan without Wi-Fi?</h3>
      <p class="mb-0">Yes. WhatsApp calls work over mobile data just as well as over Wi-Fi. If you have a Japanese eSIM or SIM card with a data plan, you can make and receive WhatsApp calls anywhere you have a mobile signal — on the train, in the mountains, at a festival. For long video calls, Wi-Fi is recommended to preserve your data allowance.</p>
    </div>

<div class="faq-item">
      <h3>Can I use WhatsApp with an eSIM on an iPhone?</h3>
      <p class="mb-0">Yes. WhatsApp works on iPhones with eSIM exactly the same way as with a physical SIM. iPhone 11 and later models all support eSIM. Make sure WhatsApp is verified before switching to the Japanese eSIM. For full eSIM setup instructions, see our <a href="https://prepaidsim.cdjapan.co.jp/eSIM/article/8">Japan eSIM setup guide</a>.</p>
    </div>
  </div>

<div class="mb-5">
    <h2 class="section-title">Summary</h2>
    <ul class="mb-0">
      <li class="mb-2"><strong>WhatsApp works in Japan</strong> on any data connection — eSIM, SIM card, or Wi-Fi.</li>
      <li class="mb-2"><strong>Verify your account before departure.</strong> A data-only eSIM cannot complete WhatsApp's SMS verification step.</li>
      <li class="mb-2"><strong>Your number stays the same.</strong> Switching to a Japanese eSIM doesn't affect your WhatsApp account.</li>
      <li class="mb-2"><strong>Data usage is low.</strong> Even daily 1-hour video calls use under 400 MB/day — a 30 GB plan is more than enough for most trips.</li>
      <li class="mb-2"><strong>For connecting with locals, use LINE.</strong> Japanese residents use LINE, not WhatsApp. Register LINE before leaving home too.</li>
    </ul>
  </div>

<div class="cta-box text-center mb-5">
       <h2 class="fw-bold mb-3">Ready to use WhatsApp in Japan?</h2>
    <p class="mb-4" style="font-size:1.05rem;">CDJapan Rental eSIM runs on Japan's docomo network — instant QR code delivery, no airport queues. Use WhatsApp from the moment you land.</p>
    <a href="https://prepaidsim.cdjapan.co.jp/eSIM/" class="btn btn-light btn-lg">Buy Japan eSIM →</a>
  </div>

</div>

emoji転換

日本語原稿

<p class="mb-5">
  日本へ旅行する際、滞在中の安定した通信環境を確保するために、ポケットWi-FiのレンタルやSIMカード、eSIMの購入が必要になります。<a href="https://rental.cdjapan.co.jp/index_en_jpy_7.html" class="text-decoration-none">ポケットWi-Fiのレンタル</a>を利用すれば、複数のデバイスを同時にインターネットに接続できるため、家族や友人とグループで日本を旅行する際に非常に便利です。一方で、最近では手軽に利用できる<a href="https://prepaidsim.cdjapan.co.jp/eSIM/" class="text-decoration-none">eSIM</a>の人気も急速に高まっています。
</p>

<p class="mb-5">
  日本に旅行で滞在中、母国の家族や友人と連絡を取り合う人も多くいると思います。そんな時に最もよく使われる通信アプリの一つがWhatsAppです。
  一部の方は「日本のeSIMを使ってもWhatsAppはそのまま使えるのか？」と不安に思うかもしれません。この記事では、日本でのeSIM利用とWhatsAppに関する情報をまとめて解説します。
</p>

<section class="my-5">
  <h3 class="h3 border-bottom pb-3 mb-4 mt-5">日本滞在中にWhatsAppは使えますか？</h3>
  <p class="mb-4">
    結論から言うと、WhatsAppは電話番号そのものを必要としない（データ通信で動作する）ため、日本滞在中も無料の音声通話やビデオ通話が可能です。
  </p>
  <div class="alert alert-info mb-4">
    <p class="mb-0">
      重要：<b>WhatsAppがスマートフォンにインストールされており、すでに電話番号による認証が完了</b>している必要があります。日本へ出発する前に、必ずWhatsAppの認証を済ませておいてください。
    </p>
  </div>
  <p class="mb-5">
    一度認証が完了していれば、インターネット接続（eSIMやWi-Fi）がある限りWhatsAppを使用できます。たとえ日本国内で利用するためにSIMカードを抜いたり、eSIMに切り替えたりしても、認証に使用した元の電話番号のアカウントをそのまま継続して利用することが可能です。
  </p>

<h3 class="h3 border-bottom pb-3 mb-4 mt-5">なぜ自国の番号のまま日本のeSIMで通信できるのか</h3>
  <div class="mb-4">
    <p class="fw-bold mb-2">【WhatsAppの仕様と本人確認】</p>
    <p class="mb-2">WhatsAppのアカウントは、アプリを起動する際の「本人確認（SMS認証）」によってデバイスに紐付けられます。</p>
    <p class="mb-2"><span class="badge bg-secondary me-2">仕様のポイント</span>一度自国でアクティベーション（本人確認）が完了していれば、アプリはその「ID（電話番号）」を保持し続けます。</p>
    <p class="mb-2"><span class="badge bg-secondary me-2">通信の仕組み</span>その後のメッセージ送受信や通話は、電話回線ではなく「IP通信（データ通信）」で行われます。そのため、日本のデータ専用eSIMや現地のWi-Fiなど、どのインターネット回線を経由しても、あなたのID（元の番号）で通信が可能です。</p>
  </div>
  <div class="card bg-light mb-5">
    <div class="card-body p-4 text-center">
      日本に訪れる前にWhatsAppが正しく利用できていれば、日本のデータ専用eSIMに差し替えても、再認証の手間なくそのままの番号で友人と連絡が取れます。
    </div>
  </div>

<h3 class="h3 border-bottom pb-3 mb-4 mt-5">WhatsApp通話を利用するための基本条件</h3>
  <ul class="list-group list-group-flush mb-5">
    <li class="list-group-item"><b>WhatsAppアプリのインストール</b>：自分と相手の両方がWhatsAppをインストールしている必要があります。</li>
    <li class="list-group-item"><b>インターネット接続</b>：Wi-Fiまたはモバイルデータ通信が必要です。Wi-Fiを利用すれば、モバイルデータの消費を節約できます。</li>
    <li class="list-group-item"><b>連絡先の登録</b>：連絡を取りたい相手の電話番号を、国番号を含めた国際形式（例：+1や+44など）で登録しておく必要があります。</li>
  </ul>

<h3 class="h3 border-bottom pb-3 mb-4 mt-5">WhatsAppの国際通話料金</h3>
  <p class="mb-5">
    WhatsApp同士の通話は無料です。国内・国際問わず、アプリ自体の利用料はかかりません。<br />
    これは、WhatsApp通話がVoIP（インターネット・プロトコルによる音声通信）という技術を使用しており、電話回線ではなくインターネット上のデータ転送を通じて行われるためです。
  </p>

<h3 class="h3 border-bottom pb-3 mb-4 mt-5">WhatsAppを使って日本で着信する</h3>
  <p class="mb-5">
    WhatsAppを使えば、世界中どこからでも着信を受けることができます。日本にいても、海外にいる家族や友人からの連絡をリアルタイムで受け取ることが可能です。ただし、受信側がインターネットに接続されており、発信側もWhatsAppを使用している必要があります。
  </p>

<h3 class="h3 border-bottom pb-3 mb-4 mt-5">利用上の注意点</h3>
  <div class="row g-4 mb-5">
    <div class="col-md-4">
      <div class="p-3 border rounded bg-white h-100">
        WhatsAppはVoIPを利用しているため、一般の固定電話や携帯電話の番号へ直接発信することはできません。
      </div>
    </div>
    <div class="col-md-4">
      <div class="p-3 border rounded bg-white h-100">
        音声通話やビデオ通話を長時間行うと多くのデータを消費します。そのため、長電話をする際はWi-Fi接続での利用が推奨されます。
      </div>
    </div>
    <div class="col-md-4">
      <div class="p-3 border rounded bg-white h-100">
        長時間通話をする予定がある場合は、大容量のデータプランが設定されたeSIMを購入するか、ポケットWi-Fiをレンタルすることをお勧めします。
      </div>
    </div>
  </div>
</section>

<section class="my-5">
  <h3 class="h3 border-bottom pb-3 mb-4 mt-5">日本でのWhatsAppデータ通信量の目安</h3>
  <p class="mb-4">日本での通信にeSIMを利用する場合、予想されるデータ消費量の目安は以下の通りです。</p>

<div class="table-responsive mb-5">
    <table class="table table-bordered table-striped align-middle">
      <thead class="table-dark">
        <tr>
          <th style="min-width: 150px;">機能</th>
          <th style="min-width: 150px;">データ消費量</th>
          <th>備考</th>
        </tr>
      </thead>
      <tbody>
        <tr>
          <td>テキストメッセージ</td>
          <td>1通あたり約1KB</td>
          <td>（メディアなし）消費量は極めて少なく、数百通送っても影響はほとんどありません。</td>
        </tr>
        <tr>
          <td>音声通話</td>
          <td>1分あたり 0.15MB - 0.5MB</td>
          <td>(150KB - 500KB) ビデオ通話より消費が少なく、安定した通信が可能です。</td>
        </tr>
        <tr>
          <td>ビデオ通話</td>
          <td>1分あたり 3MB - 6MB</td>
          <td>最もデータを消費します。高解像度設定ではさらに消費量が増加します。</td>
        </tr>
        <tr>
          <td>メディア共有</td>
          <td>
            <b>画像:</b> 50KB-500KB / 枚<br>
            <b>動画:</b> 500KB-2MB / 分<br>
            <b>音声:</b> 100KB-1MB / 分
          </td>
          <td>ファイルサイズや解像度により変動します。動画が最も多く消費します。</td>
        </tr>
        <tr>
          <td>バックグラウンド通信</td>
          <td>24時間あたり約1KB</td>
          <td>アプリがバックグラウンドで動作している際の消費はごくわずかです。</td>
        </tr>
      </tbody>
    </table>
  </div>

<h4 class="h5 mb-4">1時間のビデオ通話に必要なデータ量</h4>
  <p class="mb-4">
    最もデータを消費するのはビデオ通話です。1時間連続でビデオ通話をした場合の消費量は以下の通りです。
  </p>

<div class="table-responsive mb-4" style="max-width: 500px;">
    <table class="table table-bordered align-middle">
      <thead class="table-dark">
        <tr>
          <th>機能</th>
          <th>データ消費量（1時間あたり）</th>
        </tr>
      </thead>
      <tbody>
        <tr>
          <td>ビデオ通話</td>
          <td class="fs-5 text-primary fw-bold">180MB - 360MB</td>
        </tr>
      </tbody>
    </table>
  </div>

<div class="alert alert-warning mb-5">
    日本滞在中、WhatsAppで毎日1時間のビデオ通話を予定している場合は、1日あたり少なくとも1GB程度の余裕があるeSIM/SIMカードを購入するか、<a href="https://rental.cdjapan.co.jp/index_en_jpy_7.html" class="fw-bold">ポケットWi-Fiをレンタル</a>することをおすすめします。
  </div>
</section>

<section class="my-5 shadow-sm p-4 bg-white rounded">
  <h3 class="h3 border-bottom pb-3 mb-4">日本でのコミュニケーションアプリ(LINE)</h3>
  <p class="mb-4">
    日本ではWhatsAppよりも「LINE」というアプリが広く普及しています。日本人は連絡先を交換する場合、LINEのことを意味します。日本への旅行者が日本に到着してからLINEアカウントを新規作成するのは非常に困難です。LINEの登録にはSMS認証ができる「電話番号」が必要ですが、旅行者向けのeSIMの多くはデータ通信専用でSMSが使えないためです。もし、日本人と触れ合って連絡先を交換することになる場合、日本に来る前に、LINEも登録しておくといいかもしれません。
  </p>

</section>