Maybe you missed this — when end-to-end encryption was launched, they mentioned that they did not yet encrypt iOS, nor group chat.
https://whispersystems.org/blog/whatsapp/
Did they make a subsequent announcement that they were encrypting those?
https://whispersystems.org/blog/whatsapp/
Did they make a subsequent announcement that they were encrypting those?
Also, I guess it is possible that the so called terrorists used iPhones, but I think there's a higher chance they used Android phones. Of course we don't know exactly, but either way you shouldn't have assumed Whatsapp uses end-to-end encryption even before this.
So those who thought Whatsapp was "safe", treat this as yet another warning sign that you shouldn't be using it for private conversations.
Those who were already paranoid about it, you probably weren't using it already for that, so this changes nothing.
As of May 2015, iOS has 53.5% of the mobile market Android 41.7% (in Belgium) - source: http://howwebrowse.be/
They most certainly did:
Good point, thanks