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Psssst

WhatsApp still doesn't have the new fancy encryption on iPhones, and you don't have to turn off SMS completely for iMessage; you just disable SMS fallback for users who are registered for iMessage

Whatsapp is secure by default

Source, please?

http://www.wired.com/2014/11/whatsapp-encrypted-messaging/

Is it on iOS yet? According to this post [1], it is only on two of the seven platforms that WhatsApp supports.

1. https://www.reddit.com/r/netsec/comments/34e6si/whatsapps_en...

You can disable SMS fallback which makes it so those you iMessage with won't receive an SMS if the message doesn't work while preserving SMS capabilities with non-iMessage users.

You don't have to shut off SMS, but it is only encrypted with another iOS device, although I am hopeful they will release an Android client as difficult as that would be.