WhatsApp in Hong Kong: How to Message Hotels, Restaurants and Tour Operators and Keep Your Thai Number

Why WhatsApp matters in Hong Kong

People in Hong Kong use WhatsApp for friends and for business. Restaurants, hotels, clinics, equipment shops and tour operators often put a WhatsApp button or number on their websites and Google Maps pages. Visitors can ask a short question there faster than by email or an international call.

LINE, which Thai travellers know well, is not widely used locally, so most businesses do not answer customers there. You can still chat with your Thai friends on LINE as usual, because Hong Kong does not block it.

Keeping your Thai number with a data-only eSIM

WhatsApp is tied to the phone number you registered, not to the SIM that carries the internet. If you install a data-only eSIM and set it as your mobile data line, your existing WhatsApp account stays online. You need no Hong Kong number and no new account.

To avoid roaming charges on the Thai SIM, turn off its mobile data and enable data only on the eSIM line, while leaving the Thai line on to receive SMS. This is set in your phone's SIM menu.

Check before departure

1. 1Update WhatsAppUpdate to the latest version while you still have home Wi-Fi.
2. 2Back up your chatsBack up your chats in case you change phones or run into trouble.
3. 3Turn on two-step verificationSet a PIN so nobody else can take over the account.
4. 4Test the eSIM with one messageInstall the eSIM over Wi-Fi before flying, turn roaming on for that line and send one message.
5. 5Save key contactsSave the hotel and tour operator WhatsApp numbers with your booking codes.

Messaging hotels, restaurants and tour operators

• Hotels: ask about check-in time, luggage storage and airport transfers. Put your name, stay dates and booking code in the first message.
• Restaurants: ask whether there is a table and which days they open. Confirm current opening hours with the restaurant directly.
• Tour operators: confirm the meeting point, time and the backup plan for heavy rain or typhoon signals.
• WhatsApp Business accounts: these show a business label and sometimes a catalogue, automatic replies and business hours. You chat as usual.

Keep messages short and in plain English. Avoid sending card numbers or passport photos over chat, and if a business asks for sensitive details, first check that the account matches the number on its official website.

Calls over data, and reaching contacts in China

Without a Hong Kong number, voice and video calls over WhatsApp work well as long as your data signal is stable. Coverage is generally strong in the city and in MTR tunnels, but outlying islands and country trails can be weaker.

For contacts in mainland China, especially if you visit Shenzhen, use WeChat, the main app there. Mainland data routing is covered in the Hong Kong to mainland guide.

Whenever you change hotels, send a short message with your estimated arrival time. Hong Kong hotels can often prepare a room or hold luggage more easily when they know your timing, and you avoid waiting at the desk for small questions. If you travel in a group, create a trip group on WhatsApp before you fly so you can share meeting locations.

When messages do not go through or nobody replies

The common problems are usually easy to fix. First check that the active data line is the eSIM and that roaming is on for that line. Then load one web page. If the page opens but WhatsApp will not send, close the app and open it again.

• No instant reply: small shops may answer in bursts, so wait a while before following up and avoid repeating the same message.
• Time difference: Hong Kong is one hour ahead of Thailand, so check the time before you set a meeting or call.
• Important details: ask the business to confirm times and meeting points in writing, then screenshot the reply.

Data use and Wi-Fi

Plain text uses very little data, while photos, videos and video calls use more. For a closer look, see “How much data do LINE and WhatsApp use?”. When hotel or mall Wi-Fi is available, download large files there.

Piani — Check Hong Kong eSIM

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