Elon Musk announced it in a post on X on 25 October. xAI’s own changelog and help pages, read 26 October, do not cover calling yet, so the brief below is where you set the rules.
The prompt: brief your Bot before it calls
A brief matters because the person on the line cannot see your chat, so the Bot can only follow the limits you write down. For a first, simple call, the quick brief covers the essentials:
Before you phone anyone for me, read this back to me and wait for my "go". - Who to call, and the number: [the business, [phone number]] - Why, in one sentence: [e.g. "book a table for four at 7pm on Saturday"] - What counts as done: [e.g. "a booking under my name, with a reference number"] - Never share: passwords, PINs, codes texted to me, card or bank numbers, ID numbers, or [add your own] - Hang up and tell me if: [e.g. "they ask for a payment", "on hold for more than 30 minutes"] Say you are an AI in your first sentence, agree to nothing outside this brief, and send me a summary of what was said and agreed.
For anything with money, an account or a deadline, use the full brief below. The brief asks it to read the plan back and wait for your “go”. xAI has not said whether it will always obey that, so stay nearby for your first calls.
You are about to make a phone call for me to a person or business who cannot see this chat. Act like a trusted assistant ringing on behalf of their employer: you speak for me only inside the limits below. Anything you agree to on the call may be hard to undo, because the business can act on it before I read your summary, so getting it right matters more than getting it done. Use only the number in my brief. If it is missing or does not connect, stop and ask me; do not search for a number yourself. THE CALL BRIEF (I fill this in for each call; any line can say "not stated") - Who you are calling: [the business or person, the number, and what they are to me, e.g. "Lakeside Vet, [phone number], my dog's vet" or "my internet provider's billing line, [phone number]"] - Why I am calling, in one sentence: [e.g. "move Rufus's check-up from Thursday to any weekday morning next week", "find out why my bill rose by [amount] this month and get the old price back", "book a table for four at 7pm on Saturday"] - What counts as done: [e.g. "a new date and time confirmed", "the old price restored from the next bill, with a reference number", "a booking under my name"] - Fallbacks I accept, in order: [e.g. "1. a weekday afternoon, 2. the week after, 3. the cancellation list"; or "none"] - Facts you may share: [e.g. "my full name, my callback number, account number [account number], my dog's name and date of birth"] - Facts you must never share: [e.g. "any card or bank number, passwords, PINs, codes texted to me, government ID numbers, my home address, health details"; add your own] - Saying you are an AI: [say so in your first sentence] - What you may agree to without asking me: [e.g. "any slot on my fallback list", "holding the table until 7.15pm"] - Price ceiling: [the most I will pay in total, fees included, e.g. "no more than [amount] a month after the change", or "nothing: agree to no charge at all"] - Payment details: [do not use any saved card or give any card number on this call] - What you must never say or agree to: [e.g. "a new contract, plan or upgrade, any extra service, cancelling anything else, a complaint I have not told you about"] - When to hang up and report back: [e.g. "on hold for more than 30 minutes", "they ask for a payment", "they will only speak to the account holder", "anyone gets angry or asks why I am not calling myself"] - Voicemail: [e.g. "leave my name and callback number only", or "hang up without a message"] - Anything from earlier: [past calls, staff names, reference numbers, or "first call"] STAGE 1. READ IT BACK AND WAIT Before you dial, tell me in five lines or fewer: who you will call and on which number, the one result you are after, your first fallback, the price ceiling, and the first thing that would make you hang up. Then list anything missing as [NEED: what is missing], for example a reference number the business will almost certainly ask for, or a goal too vague to confirm on a call. If two lines clash, such as a fallback that breaks the price ceiling, say which and ask me which wins. Do not call until I reply "go". STAGE 2. ON THE CALL - Open by saying who you are calling for, follow my AI line above, and state the one thing I need. If anyone asks whether you are an AI, answer truthfully. - If they offer what counts as done: repeat it back to them, ask for a reference number and the name of the person you spoke to, and ask whether they can send written confirmation by email or text. - If they cannot do that but can offer something on my fallback list: take the highest fallback they can give, and confirm it the same way. - If they offer something not in my brief, such as a discount, an upgrade, a new plan or a different product: say I will think about it, agree to nothing, and note the exact offer and its price. - If a total goes above my price ceiling, or a fee appears that I did not mention: agree to nothing, ask them to repeat the full total with fees, note it, then try the next fallback or end the call. - If they ask for anything on my never-share list, or for a code sent to my phone: say I will provide it myself, and ask how I can do that step directly. - If they need the account holder, a payment or a security answer you do not have: do not guess. Ask how I can finish it myself (by phone, online or in person) and end the call. - If you reach a phone menu: choose the option closest to my reason for calling; if none fits, choose the one for a person or customer service. - If they will only deal with me in person or refuse to talk to an assistant: ask what I need to do to authorise you or to call myself, note it, and end the call. - If you are transferred: give the new person my reason for calling again, and note their name and department. - If they offer to call back: give only the callback number on my may-share list, note the time they promised, and tell me in the report. - If a hang-up rule is met: end politely and say I will be in touch. - Never invent an account detail, a date, a reason or a story about me to get past a question. If you do not know, say you will check with me. STAGE 3. THE REPORT Send me a summary in this order: 1. Number dialled, time of the call and how long it lasted, including time on hold. 2. Result: done, partly done or not done, in one line. 3. What was agreed: each item with its date, time, price including fees, and the name of the person who agreed it. Write "not given" for anything they did not say. 4. Reference number and written confirmation: what they gave, or "not given". 5. Offers you turned down for me, with the price they quoted. 6. What you shared: every fact from my brief that you said on the call. 7. Their words for any price, date, deadline or policy, as close to exact as your notes allow, marked "close paraphrase" where not exact. 8. What I still need to do, with any deadline. 9. Anything you were unsure you heard correctly. STAGE 4. CHECK YOUR SUMMARY AGAINST MY BRIEF Before you send the report, go through my brief line by line and end the report with this check: - The result matches what counts as done, or the gap is named. - Every agreement is on my may-agree list or my fallback list. If one is not, put it at the very top under WARNING, because I may need to reverse it. - No total went above my price ceiling, and no saved payment detail was used beyond what I allowed. - Nothing on my never-share list was said. If it was, put that under WARNING too. - Every number, date and name in the report came from the call, never from a guess. - Voicemail followed my voicemail line. - Anything you could not hear clearly is marked as unsure.
How to start a call
- Ask your Bot first. xAI has not published how a call is started, so ask your Bot: “Can you make phone calls for me yet?” If it says no, wait.
- Pick one Bot for your calls. xAI’s overview says each Bot keeps its own conversations and learned context, so keeping calls with one Bot keeps the history of earlier calls in one place.
- Add an Ask first rule. Auto-review is the setting where you write rules for what the Bot must check with you first. Open
Settings > General > Auto-reviewand add a rule such as “Ask first before agreeing to any payment or booking”. - Do not rely on this setting to stop a call. The approvals page says an Ask first rule wins when rules clash, but it does not mention calls, so the brief carries the same limits.
- Keep cards out of calls. Since 23 October a Bot can save your logins, cards and contact details to a Vault, a saved store in Settings, and fill them in at checkout. The brief tells it to use no saved card and give no card number on a call.
- Paste the brief and read the plan back. A wrong number or a missing price ceiling is easy to fix before anyone answers and awkward to fix after. Answer anything marked NEED, then reply “go”.
- Send “Stop now” if it goes wrong. The messaging page says a direct message from you takes priority over work in progress, and to send “Stop now” when work should end immediately, so keep it ready and let the hang-up line in your brief do the rest.
How to check the summary
- Match the result to your “what counts as done” line. Compare the date, time and price word for word, because “next week” and “Tuesday the 3rd” are easy to blur in a summary.
- Read the WARNING lines first. The prompt puts anything you did not allow at the top, and the approvals page says an approval never reverses work already done, so an agreement made on the call needs fixing with the business itself.
- Check what was shared. Line 6 of the report lists every fact the Bot gave out. Anything you did not put on the may-share list is worth a call back.
- Chase the reference number. If the report says “not given” for a booking, a refund or a cancellation, ring back or ask the business to email you, since a summary is the Bot’s own account of the call.
What xAI has not said yet
- The basics are unconfirmed. As of 26 October, xAI has not confirmed which plans or countries get calling, whether it costs extra, whether the Bot says it is an AI, or whether calls are recorded, so stick to low-stakes calls until the help pages cover calling.
- Recording and AI voice rules depend on where you live. Rules on recording calls and on using an AI voice differ by country and sometimes by state. Check yours before the first call. xAI has not said whether it records calls or tells people it is an AI.
- Some things never go on a call. Never let it give passwords, PINs, codes texted to you or card numbers; the brief tells it to hand those steps back to you.
- The check that counts is written confirmation. For anything with money or a deadline attached, get the business’s own email or text, and treat the Bot’s summary as the draft.
The facts here come from Elon Musk’s post of 25 October and xAI’s Grok Bot help pages and changelog, read 26 October 2026, when the changelog’s latest release was 0.75.5 with no calling entry. Musk’s post is the only source for calling itself.
Do it now
Pick one easy call for this week, such as checking a shop’s opening hours or whether an item is in stock, fill in the brief (write “not stated” for any line that does not apply), and read the report against it.
Once a couple of those come back clean, try a booking, and choose businesses that take bookings with no deposit.
A few quick questions
Which plans include Grok Bot?
On The X Subscription, launched on 12 October, xAI’s Grok Bot page says it comes with Premium, Super and Ultra; Free and Plus do not include it. Older Cursor, SuperGrok and Grok Business plans carry on until you switch, per its overview. Current plans are on x.ai/pricing. xAI has not said which plans include calling.
Is calling on my plan?
xAI has not said. Ask your Bot whether it can make phone calls for you yet.
Does it cost extra?
xAI has not said whether calls cost extra or use more of your usage.
Will the business know it's an AI?
xAI has not said, so the brief tells your Bot to say so at the start of the call.
Is this the same as a voice chat with my Bot?
Start voice chat is you talking live to your own Bot, as the messaging page describes. A call is the Bot ringing someone else for you and reporting back in the chat afterwards.