Thanks for sharing your opinion with us. I personally like the new call UI 😀.
Since this suggestion is based on your preferences, to escalate the suggestion further, we would need more people to be interested in this change and want to have this change implemented on their devices.
When more people confirm being interested in this idea, I will be able to send it to Korea.
Users supporting your idea can give likes to your post. Let's say we need 20 likes to send your idea further 😉.