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Whatsapp is going to run terribly...
(www.androidcentral.com)
This is a most excellent place for technology news and articles.
Luckily they don't have to switch. Your good friends from the European union have a solution for you (And the latest beta for whatsapp features the skeleton for their implementation of that standard)
Except Signal likely won't adopt that, as they already mentioned some time ago
All hail the European union