The most recent update to WhatsApp's Android app includes a surprising feature: strong end-to-end encryption, enabled by default. It's the strongest security any major texting app has offered, even compared with similar tools from giants like Google, Microsoft, and Apple. WhatsApp partnered with Open Whisper Systems for the launch, using open source code to build in the new features. It's unclear when the features will come to iOS, but just reaching WhatsApp's Android users represents a huge step forward for everyday encryption use.
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WhatsApp Boosts Android Security and User Experience with Passwordless Login, Eliminating Two-Factor SMS. Here's How to Activate It.
Not really necessary, but I can see why they did that.
I am happy that they resolved this long standing issue with privacy.