Grok @Bot's new calling feature is very impressive. You just tell it who to call and why, and it handles the conversation for you. It shows a real-time transcript of the call, and if Grok needs additional info from you, a little answer box pops up where you type/select your response, and Grok relays it to the person on the phone. Pretty incredible. Here's an example (with the call audio) of what's it's like to use: