Google debuts video calling app Duo

|By:, SA News Editor

Google (GOOG, GOOGL) is trying again with a new video chat application called Duo, which works with both Android and iOS devices.

The app runs on Wi-Fi and cellular networks, automatically switching between different speeds of connection to adjust video quality.

Duo also uses phone numbers, rather than Gmail addresses, and has a "knock knock" feature that displays a live video preview of who is calling.

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