How can I use it in China Mainland?

Zero Trust 1.1.1.1
1

Due to the existence of Great Firewall, we are unable to use 1.1.1.1 normally.

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2

On Android 9 or above, you can set Private DNS to 1dot1dot1dot1.cloudflare-dns.com.
On Android 4.0.3 - 8.1, you can use Intra.

On PC, you can use Firefox Browser with Enable DNS over HTTPS.