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Signed in as —
Manage

With —
Securing…
—

Compare these six words with the other person in person, once. They stay the same for the two of you. If they ever change, stop and check.

Securing the session…

Calling…
Incoming call
On call
Voice: Deep

The other person hears the altered voice; you do not, unless you use "Hear my voice" (use headphones). The exact settings are randomized for every call and never leave your device.