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Re:SS7 MITM Attack Against WhatsApp and Telegram by ashitlerferad on Tuesday May 10, 2016 @09:03PM (#11671938)
There are several ways:

Central authorities: SSL, DNSSEC

TOFU: SSH, OTR etc

Web of trust: OpenPGP

Not sure, but I think Signal/WhatsApp a combination of central authority, TOFU and in-person 2 party verification, but no web of trust.

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