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Earlier this week, X (formerly Twitter) announced that voice and video calls are now available to everyone. 

After X gave all users the option to make voice and video calls, it was announced that the system shows each user's IP address when they make a call.

X

This detail was added as a Community Note to X's official announcement:

HOW TO BLOCK CALLS ON X?

First open the X app on your smartphone to access the relevant settings. 

Tap on the envelope icon used to access your direct messages and click on the settings gear at the top of the screen.

You will now be presented with a series of options. You can directly block all video and voice calls by unchecking the box that says "Enable voice and video calling".