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The Great Firewall of China is an interesting thing from a technical point of view. My fiance was on a business trip for 3 days in China and as long as she used her Korean SIM card with roaming everything worked well. But then she bought a Chinese SIM card and suddenly things started going very weird.

I was very worried because for half a day I couldn't get hold of her.

I really wonder how they do it, KakaoTalk, Signal and SMS I have some ideas, but how did they interfere with the communication between her iPhone and my Matrix server in Germany? It's a super small server, only 4 users on it.

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