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A fantastic and widely recognised alternative is Signal for iOS, (and its counterpart for Android, TextSecure), created by Open Whisper Systems. People like Edward Snowden have been praising it.

iOS: https://itunes.apple.com/gb/app/signal-private-messenger/id8...

Android: https://play.google.com/store/apps/details?id=org.thoughtcri...

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> Signal uses your existing phone number and address book.

Failure, why restrict your users to their phone numbers?

WhatsApp does this too. I find it very inconvenient since I have many devices. I think it's not for security as much as theft/identity. It's a lazy way of forcing what is essentially 2fa on a user. Just give me real 2fa and let me use all my devices please.

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