Censorship at his best...
In the deepest of Android, in the @OnePlus 5T, there is a special treatment if you are in China...pic.twitter.com/SRBaDGU5zc
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bingo. I think it's due to the fact that China's Great Firewall is filtering out Google, so you cannot see if you're in a captive portal. Shoukld be the same for nearly all smartphones.
Yes you right. I wonder if the Chinese government review this code before a product launch 
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