Google Duo allows you to call people who don't have the app

Google Duo allows you to call people who don't have the app  Engadget Select Users Can Now Receive Google Duo Calls Without The App  Android Headlines You can now make Duo calls to (some) users who don't have the app installed  9to5Google Duo calls can now be made with some users that don't have it installed, Allo chats also improved - Android Police  Android Police Google Duo's voice and video calls work even when your contact doesn't have the app  TNWFull coverage

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