A80 mobile "one ui 3.1" update after call reception problem.. and dialor also slow laging... Incoming call lift after 10 Seconds after recive the voice

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Samsung Galaxy A80 is one ui 2.5 when are rollout date.. #a80 single take camera feature are receive not receive? 

Why not showing Galaxy A80 mobile on exchange model list.. amazon and flipkart

Ram management showing different on A80...  Device maintenance Ram 3.7GB used on 8GB and Samsung member application clean memory has showing  available 3.4GB on 8GB at same time difference...  Why ????? Users cheak once...