Privacy Policy

Updated Date: January 23, 2026

This Privacy Policy explains how SUCCESS LINK OVERSEAS HK LIMITED (“we”, “us”, or “our”), as the developer of Bilin (“Bilin” or the “Service”), collects, uses, stores, shares, and protects your information when you access and use our applications, websites, and related services.

We understand the importance of your personal information and are committed to protecting your privacy in accordance with applicable laws and regulations. Please read this Privacy Policy carefully before using Bilin so that you can make informed choices.

By using Bilin, you acknowledge that you have read and understood this Privacy Policy.

1. INFORMATION WE COLLECT AND HOW WE USE IT

We collect information to provide and improve the Service, ensure its security and stability, and comply with legal obligations. We collect only the minimum amount of information necessary for these purposes.

1.1 Account and Identifiers

You can use Bilin either as an anonymous user or by creating an account:

- Anonymous “guest” identifier:

When you first launch the app, we may generate a unique, anonymous identifier associated with your device or installation (for example, an app-specific ID). This identifier is used to:

- recognize you as a unique user without knowing your real-world identity;

- maintain your Service configuration and purchased subscription status.

- Optional account information:

If you choose to create or link an account (for example, by providing an email address or using a third-party login such as Google Sign-In), we may collect:

- email address;

- display name or nickname (if you choose to provide one);

- authentication identifiers provided by the login provider (such as a Google user ID).

We use this information to:

- provide login and account management;

- synchronize your subscription and settings across devices;

- contact you when necessary for service-related notifications (for example, security alerts, subscription changes).

We do not require you to provide your real name or phone number to use the Service.

1.2 Network Acceleration and Connection Data

The core function of Bilin is to provide secure network acceleration and optimized connections. We do not inspect or store the content of your internet traffic.

Specifically:

- We do not log the websites you visit, the content you view, or the data transmitted through the encrypted tunnel, except as described below for limited diagnostic and operational purposes.

- We do not store the IP addresses assigned to you by our acceleration nodes beyond what is necessary for real-time connection management.

For billing, network operations, abuse prevention, and troubleshooting, we may temporarily process limited usage data, such as:

- connection timestamps (start and end time);

- the region or server you connected to;

- total data volume transferred per session or per billing period;

- your general IP address at the time of connection (for example, to detect unusual activity or to comply with legal requirements).

We use this data to:

- provide the Service you requested;

- maintain and optimize the performance and stability of the network;

- detect and prevent fraud, abuse, and security incidents;

- comply with applicable laws and legal processes.

We do not retain detailed traffic content logs. Where we collect usage data for troubleshooting purposes, we retain it only for as long as necessary to resolve the issue and then delete or anonymize it.

1.3 Device Information and App Logs

To ensure the security and proper functioning of the Service, we may collect certain device and app-related information, such as:

- device model and manufacturer;

- operating system and version;

- app version;

- language and region settings;

- network type (e.g., Wi-Fi, mobile network) and basic network quality indicators;

- anonymized device or installation identifiers (for example, advertising ID, Firebase installation ID), depending on your device settings and system permissions.

We may also collect application logs related to:

- app startup and shutdown;

- error and crash reports;

- feature usage events (for example, which screen is opened, button clicks, session duration).

We use this information to:

- provide and improve the Service;

- diagnose technical issues and crashes;

- maintain security, prevent abuse, and ensure compatibility across devices;

- perform aggregate statistics and analytics (for example, feature usage and performance).

We do not use device or app information to build profiles about you for advertising purposes beyond what is permitted by Google Play policies and your system settings.

1.4 Location-Related Information

To recommend optimized routes and improve connection performance, we may use:

- your approximate location inferred from your IP address; and/or

- network condition information (e.g., latency, packet loss, region of connection).

We use this information to:

- automatically suggest suitable servers or routes;

- balance network load and improve performance.

We do not require precise GPS location to provide the core Service. If we ever request access to device location permissions beyond IP-based approximation, we will clearly explain the purpose and obtain your consent in accordance with applicable laws and platform policies. You may refuse such permissions, and you will still be able to use the basic network acceleration functions.

1.5 Customer Support

If you contact our customer support, we may collect:

- your email address or other contact details you choose to provide;

- your questions, feedback, and related communications;

- optional diagnostic information you choose to send (such as screenshots or logs).

To assist you, the app may request access to:

- Photos/Media: to allow you to attach screenshots or images to your support request;

- Microphone: if you use any voice-based feedback or communication features.

Granting these permissions is optional. If you refuse, you will not be able to use the corresponding additional feature (for example, sending screenshots), but you can still use the core network acceleration features.

We use customer support information solely for:

- responding to your inquiries;

- troubleshooting issues;

- improving the Service based on feedback.

1.6 Changes in the Purpose of Use

If we intend to use your personal information for a purpose not described in this Privacy Policy or not directly related to the original purpose, we will inform you and, where required by law, obtain your consent before such use.

1.7 Legal Grounds and Exceptions

We may process your personal information without your prior consent when permitted or required by applicable law, for example:

- to comply with legal obligations, court orders, or requests from competent authorities;

- to protect the vital interests of you or others (for example, in emergencies);

- for security and fraud prevention;

- for statistical or research purposes, provided the data is properly anonymized.

Where applicable law requires consent, we will obtain it before processing.

2. COOKIES AND SIMILAR TECHNOLOGIES

We may use cookies and similar technologies (such as local storage, SDK identifiers, or analytics tags) to provide and improve the Service.

2.1 Purposes of Cookies and Similar Technologies

We use these technologies to:

- maintain your session and login status;

- remember your settings and preferences;

- ensure security and prevent fraud;

- measure app performance and usage (for example, aggregate statistics on features used).

2.2 Managing Cookies and Identifiers

Depending on your device and operating system, you may be able to:

- reset or limit the use of advertising identifiers;

- clear app data or cache;

- control analytics and personalization settings.

If you disable certain cookies or identifiers, some features of the Service may not function correctly, but the core network acceleration functions will remain available where possible.

3. HOW WE SHARE AND DISCLOSE YOUR INFORMATION

We do not sell your personal information. We share your information only in the limited circumstances described below.

3.1 Service Providers and Partners

We may share your information with trusted third-party service providers that help us operate and improve the Service, including:

- analytics and crash reporting providers;

- authentication and login providers;

- cloud infrastructure and storage providers;

- payment and billing providers (such as Google Play Billing).

These service providers may access your information only to perform services on our behalf and must protect it in accordance with applicable laws and appropriate contractual safeguards.

3.2 Legal Requirements and Protection of Rights

We may disclose your information when we believe in good faith that such disclosure is reasonably necessary to:

- comply with applicable laws, regulations, legal processes, or governmental requests;

- enforce our Terms of Service and other agreements;

- detect, prevent, or address security or technical issues;

- protect the rights, property, or safety of Bilin, our users, or the public.

3.3 Business Transfers

In the event of a merger, acquisition, reorganization, sale of assets, or bankruptcy, your personal information may be transferred as part of the transaction. In such cases, we will require the new entity to continue to protect your personal information in accordance with this Privacy Policy and applicable laws or to obtain your consent where required.

3.4 Aggregated and De-Identified Data

We may use and share aggregated or de-identified information (which cannot reasonably be used to identify you) for research, analytics, and business purposes. For example, we may publish statistics about overall usage patterns of the Service without identifying individual users.

4. THIRD-PARTY SDKs AND SERVICES

To provide core functionalities, improve stability, and analyze performance, the Google Play version of Bilin may integrate the following third-party SDKs. These third parties may collect certain information as described below and in their respective privacy policies.

4.1 Analytics and Crash Reporting

- Firebase Analytics / Google Analytics for Firebase

Provider: Google LLC

Information Collected: device identifiers (such as advertising ID, installation ID), app usage events (screen views, clicks, session duration), device and OS information, IP address (for approximate location).

Purpose: user behavior analysis, performance measurement, product optimization.

- Firebase Crashlytics

Provider: Google LLC

Information Collected: device model, OS version, app version, crash logs, limited device identifiers, IP address at time of crash.

Purpose: crash diagnosis and app stability improvement.

4.2 Authentication (If Used)

- Firebase Authentication / Google Sign-In

Provider: Google LLC

Information Collected: user identifiers (UID), email address (if you choose to log in with email or Google account), basic profile information you authorize (such as name or avatar), device and IP information for security.

Purpose: user registration, login, and account management.

You can choose not to use third-party login and continue as an anonymous user.

4.3 Advertising (If Used)

- Google Mobile Ads SDK

Provider: Google LLC

Information Collected: advertising ID, IP address, device and OS information, app usage and interaction with ads (impressions, clicks), network information.

Purpose: displaying, measuring, and improving in-app advertisements.

You can control ad personalization via your device settings (for example, “Opt out of Ads Personalization” on Android). We comply with your system preferences.

4.4 Payment

- Google Play Billing Library

Provider: Google LLC

Information Collected: Google Play account identifier, purchase token, product ID, purchase time and status, device and network information.

Purpose: processing in-app purchases and subscriptions, verifying purchase status.

We do not receive or store your full payment card information. All payment processing for the Google Play version of Bilin is handled by Google.

4.5 Networking and Local Storage

- Retrofit / OkHttp

Provider: Square, Inc.

Information Collected: HTTP request and response data exchanged between the app and our servers (which may include information you submit within the app), IP address, network status.

Purpose: implementing secure and efficient network communication.

- Gson (Data Serialization)

Provider: Google LLC

Information Collected: operates on app data to convert between JSON and objects; does not independently collect additional personal information.

Purpose: parsing and formatting data.

- MMKV or similar key-value storage

Provider: Tencent (for MMKV)

Information Collected: key-value pairs stored locally (for example, preferences, tokens, configuration).

Purpose: fast local data storage.

Some SDKs operate only locally and do not send data to external servers beyond our own backend.

5. HOW WE STORE AND PROTECT YOUR INFORMATION

5.1 Storage Location

Where required by applicable law, we store your personal information on servers located in jurisdictions specified by such laws. We take steps to ensure that any cross-border data transfers (if they occur) comply with applicable legal requirements.

5.2 Storage Period

We retain your personal information only for as long as necessary to fulfill the purposes described in this Privacy Policy, unless a longer retention period is required or permitted by law. When information is no longer needed, we will delete or anonymize it in a secure manner.

Examples:

- Account and subscription information: retained for as long as your account or subscription is active and for a reasonable period thereafter for billing and dispute resolution, if permitted by law.

- Logs and diagnostic data: retained for a limited period necessary to analyze and improve performance and security, then deleted or anonymized.

5.3 Security Measures

We take reasonable technical and organizational measures to protect your personal information against unauthorized access, disclosure, use, modification, or destruction, including:

- using encryption where appropriate to protect data in transit and at rest;

- implementing access controls and security policies to limit access to personal information to authorized personnel only;

- regularly reviewing our security practices and technologies.

However, no method of transmission over the internet or method of electronic storage is completely secure. While we strive to use commercially acceptable means to protect your information, we cannot guarantee absolute security.

If we become aware of a security incident that affects your personal information, we will take appropriate steps to mitigate the impact and, where required by law, notify you and relevant authorities.

6. YOUR RIGHTS AND CHOICES

Depending on your jurisdiction, you may have certain rights regarding your personal information, such as:

- Access and correction: You may have the right to request access to the personal information we hold about you and to request that we correct inaccurate or incomplete information.

- Deletion: You may have the right to request that we delete certain personal information, subject to legal retention obligations.

- Restriction and objection: You may have the right to restrict or object to certain processing, particularly where we rely on legitimate interests as a legal basis.

- Withdrawal of consent: Where we rely on your consent, you may withdraw it at any time. This will not affect the lawfulness of processing based on consent before withdrawal.

- Data portability: In some cases, you may have the right to receive your personal information in a structured, commonly used, and machine-readable format and to transmit it to another controller.

To exercise your rights, you may contact us using the contact details provided in Section 9. We may ask you to verify your identity before processing your request. We will respond within a reasonable timeframe and in accordance with applicable laws.

You can also manage some of your information directly within the app, for example by:

- updating your account information;

- changing settings and preferences;

- disabling optional permissions through your device settings.

If you wish to stop using the Service, you may uninstall the app at any time. You may also request account deletion, and we will delete or anonymize your personal information, unless we are required or permitted to retain it by law.

7. CHILDREN’S PRIVACY

The Service is not directed to children under 16, and we do not knowingly collect personal information from children under 16 without verifiable parental consent.

If you are a parent or guardian and believe that your child has provided us with personal information without your consent, please contact us using the contact details in Section 9. We will promptly investigate and, where appropriate, delete such information.

8. CHANGES TO THIS PRIVACY POLICY

We may update this Privacy Policy from time to time to reflect changes in our practices, technologies, legal requirements, or other factors.

When we make changes, we will:

- update the “Updated Date” at the top of this Privacy Policy; and

- where appropriate, provide additional notice (for example, in-app notification or email).

If the changes materially affect your rights or how we process your personal information, we will seek your consent where required by applicable law. Your continued use of the Service after the updated Privacy Policy becomes effective constitutes your acknowledgment of the changes.

9. CONTACT US

If you have any questions, concerns, or complaints about this Privacy Policy or our handling of your personal information, you may contact our data protection contact at:

Email: wenxiao@nn.com

We will review your request or complaint and respond within a reasonable period in accordance with applicable laws.

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