Viber, the free calling and messaging app that Rakuten bought for $900 million, has released a significant_update for its iOS app that introduces_a new flat design and a number of additional features. Viber for iOS 4.2 now sports an iOS 7-like layout — which the company describes as “clean and flat” — with a stronger focus on multimedia. Users can now share multiple images at the same time, while_they can also record_and share longer video messaging and block specific phone numbers. Finally, the indicator that the other person is typing has been switched on for the Android tablet app, and...

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