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Google could be testing a 'new' way to answer phone calls
An APK teardown hints at a redesign underway.
An APK deep dive reveals that it might be ditching the usual swiping up and down mechanism to answer voice calls. Additionally, you also see a "Message" option above the pill-shaped bar, to send people a text if you choose to decline their calls. While Google has stuck to the same UI for years, it would take some practice for the fingers to stop swiping up to pick up a phone call.
Or read this on Android Central