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X (formerly Twitter) now supports voice and video calls on Android. The feature was already available for iOS users since October and is now coming to Android users. Just like on iOS, you’ll need an X Premium subscription to make outgoing calls while users on the free tier can only receive incoming calls.
Audio and video calling settings on X for Android
Audio and video calls are located inside the DM settings tab. Users can also control who can call them via the settings page with options from people in their address book, verified users and acconuts they follow. The X Help Center has more details on audio and video calls.
Source (post on X.com)
