Google Duo spotted working on Android phones without app installed: Reports

Google Duo spotted working on Android phones without app installed: Reports  The Indian Express Google Duo allows you to call people who don't have the app  Engadget Google Duo lets you call users who don't have it installed; Allo gets improved chat window  Gizbot 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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