Astrill does not have a dedicated Android app for users to access it directly. Instead, the VPN service is available through the web browser or by using the built-in VPN extension in their Android device.

1. Download the Built-in VPN Extension: Go to the website of your mobile phone's internet provider (e.g., Google, Apple, or T-Mobile) and download the corresponding VPN extension for Android.

2. Access the VPN Service: Open the VPN extension and grant access to the Astrill account.

3. Use the VPN Features: You can now access the Astrill VPN service through your device's browser, using features such as secure browsing, online gaming, and file transfer.

If you prefer to use the VPN service directly from the web, you can visit the Astrill website at astrill.com and use the built-in VPN extension that comes with the browser.

If you need help with setting up your account or accessing the VPN, you can refer to the official documentation or contact Astrill support.