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Source: https://www.ndss-symposium.org/wp-content/uploads/ndss2021_1C-4_24180_paper.pdf Therefore, our recommendation to increase metadata protection is turn off read receipts, which can be toggled in the security settings. 2) Don’t use an American phone number In an earlier post on burner numbers, we talked about burner crypto text services, such as virtualsim.net which allow you to pay a tiny bit of crypto for a 1 time SMS code.