Personal data privacy policy

Updated on 29/10/2026. Applies to the bigmap.vn website and the BIGMAP app on iOS and Android.

BIGMAP (bigmap.vn) is operated by Bignet Company. We only collect the data needed for the features you use; we do not sell personal data, do not use data for targeted advertising, and do not track you across other parties' apps or websites.

1. Data we collect

• User account: full name, phone number (required, used to sign in and for businesses to contact you when you send a request), email, date of birth and address (optional, added by you), password (stored one-way hashed).
• What you submitted: inquiry messages, appointments, reviews, place suggestions, violation reports.
• Location: chỉ khi bạn cho phép, để tìm cơ sở gần bạn và tính đường đi. Khi bạn bấm “Bắt đầu” dẫn đường, ứng dụng tiếp tục cập nhật vị trí cả khi tắt màn hình (Android hiện thông báo “BIGMAP đang dẫn đường”, iPhone hiện biểu tượng vị trí trên thanh trạng thái) để chỉ dẫn từng bước, và dừng ngay khi tới nơi hoặc thoát dẫn đường. Ngoài lúc dẫn đường, ứng dụng không lấy vị trí khi chạy nền. Vị trí trong lúc dẫn đường chỉ dùng để chỉ đường (gửi lên máy chủ khi cần tính lại đường đi), BIGMAP không lưu lịch sử di chuyển của bạn.
• Search history and usage: search keywords, number of searches / directions per day (to apply quotas by account level).
• Anonymous usage statistics: places you view, filters, search terms and contact actions, linked to a random, hashed device code — never to your name, phone number, account or GPS location. Used only for aggregate statistics and to rank results more relevantly; deleted automatically after 13 months.
• ID: account ID; for business accounts, the device ID used to send new-customer notifications.
• Technical data: access time, IP address, browser / device type — to prevent spam and abuse and for security.

Ứng dụng chỉ mở thư viện ảnh / camera khi bạn chủ động gửi ảnh trong tin nhắn (hoặc chủ cơ sở đổi logo); không truy cập danh bạ hay micro, và không dùng công cụ quảng cáo của bên thứ ba.

2. Purposes of use

• Providing features: search, map, directions, messaging for advice, booking, saving places, points and levels.
• We forward your request to a suitable business for advice.
• Account management, preventing duplicate submissions, fraud and violating content; handling violation reports.
• Aggregate (non-identifying) statistics to improve the service.

3. Data sharing

• Business: when you send a message or make a booking, your name and message are forwarded to the business. Your phone number is only shown to a business that has confirmed accepting your request.
• Reviews you write is shown publicly with your shortened name.
• Service provider processing on our behalf: Vietmap (maps, address search, route calculation — receives coordinates, not account information), notification services from Expo, Apple and Google, and server providers.
• Google Analytics đo lường lượt truy cập web và app (trang / màn hình đã xem, từ khóa tìm kiếm, loại thiết bị) theo mã máy ẩn danh — không gửi tên, số điện thoại hay vị trí GPS, không dùng để quảng cáo.
• Government agency competent authorities when required by law.

4. Storage and security

Data is stored on BIGMAP's servers and transmitted over encrypted HTTPS connections. Passwords are one-way hashed. Only authorized staff can access data, and all administrative actions are logged. Account data is kept until you delete your account.

5. Deleting your account and data

You can delete your account at any time: in the app, go to Account › Delete account, or follow the instructions at bigmap.vn/xoa-tai-khoan.

When you delete your account, we immediately delete your profile, addresses, saved places, points and usage history, and sign you out of all devices. Requests and messages already forwarded to businesses are kept as transaction records between you and the business (no longer linked to your account); you can request deletion of these as well by emailing hotro@bandoso.org, we will process it within 30 days.

6. Your rights

You have the right to access, correct and delete your personal data, withdraw consent, object to or restrict processing in accordance with Vietnamese law on personal data protection. You can edit your information in Account › Personal information, turn off location / notification permissions in your phone settings, or send a request by email below.

7. Children

The service is for people aged 16 and over. We do not knowingly collect data from children; if we discover any, we will delete it.

8. Contact

Personal data protection contact: Bignet Company — email hotro@bandoso.org. When the policy changes, we update the date at the top of the page and notify you in the app if the change is significant.