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by chatmasta 3200 days ago
Possibly some mobile telecoms route outgoing VOIP calls (regardless of originating application) via their own network? I haven't looked deeply into this, but I've noticed when I call someone on FB messenger, the call shows up in Phone.app with a long "social profile" address beginning with IBTU. Not sure if this address is internal to iOS or global.

Also, is it even confirmed whatsapp encrypts voice calls in addition to texts?