https://news.ycombinator.com/item?id=12089993 … < On WhatsApp not working in Saudi. Calls are filtered by firewall, so the UI just blocks them rather than timeout.
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Of course more advanced analysis is possible, but there are development and runtime costs, hopefully high.
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I don't claim this is a fully-developed solution, just a possible framework for how it could be done.
End of conversation
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