Yes. Session currently has an open beta program available to all users where you can test the early versions of this feature.
To enable calls, please follow these steps:
Android
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Open your app settings by tapping on your profile picture in the top left corner
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Tap Privacy
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Enable the Voice and video calls option at the bottom of the menu
iOS
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Open your app settings by tapping on your profile picture in the top left corner
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Tap Privacy
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Enable the Voice and video calls option at the bottom of the menu
Desktop
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Open settings by pressing the cog on the left of the screen
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Click privacy
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Toggle the Voice and video calls switch
If you want to learn more about calls, check out this video: