One tap

Give Grok a phone number.

Tap once and a Bot lands on your own account that already knows how to get itself a real phone number. Ask it for one, answer two questions, and about a minute later you can ring it. Then it answers your calls, makes calls for you, and writes up every one.

Add it to your GrokFree to add. The line is $29 a month when you want one.

Tap once.

The Bot lands on your own x.ai account, already knowing how to give itself a phone number. Nothing to install and nothing to configure.

Answer two questions.

Your area code, and the mobile you'll call and text it from. It shows you the numbers that are free and you pick one.

Ring your own number.

It answers as your line. Then ask it to call somewhere for you, and read the write-up that lands afterwards.

The audio is a real recording. The screen is a picture of what the line is doing while it listens — the write-up itself arrives as email.
What the number does

One number, three jobs.

It answers when you can't

Someone rings and your line picks up, says it's an assistant, takes the details, and tells you what they wanted. No voicemail to wade through.

It calls for you

“Call the garage and see if they can take the car Thursday morning.” One sentence in the chat you already use, and it makes the call.

It writes every call down

The outcome, the price, the date, the name of who you spoke to, and the whole conversation — by email, and in the chat if you ask.

The part nobody else does

The line wakes your Bot.

Most tools give an assistant something it has to go and look at. When a call on your line finishes, CosVoice starts your Bot itself, with the outcome and the transcript already in hand. If the call didn't get it done, the Bot works out the next step instead of waiting to be asked. Same when someone texts the line or an email arrives at its address.

Your Bot offers to set this up after your first call. Until then every write-up arrives by email, so you miss nothing.

What it costs

Adding the Bot is free, and nothing is charged until you ask it for a number and pick a plan.

  • Starter, $29 a month. 60 minutes of calls, one US number in your area code, plus its own email address.
  • Plus is $69 with 200 minutes, Pro $149 with 600. Extra minutes are 25 cents each.
  • No per-call fee and no monthly minimum. Cancel any time; the line runs to the end of the month you paid for.

A 40-second call costs about 20 cents of your minutes. See the plans.

What it will never do on a call

It says it is an assistant whenever anyone asks, and never claims to be a person. It will not read out a card number, agree to a charge, or commit your money. Call content is sealed to your line and our staff never read it. How we hold the line.

You need an x.ai account with Grok Bot

The tap opens x.ai and adds Bot Phone Line by CosVoice to your account as your own copy. Rename it, change how it talks, keep it or delete it — from that moment it is yours and nothing you do to it reaches anyone else.

Already have a Bot you like?

Don't start over. Paste one address into the Bot you already use and it gets the same phone number and the same write-ups, keeping everything it knows about you. Connect the Bot you have, or give a line to Claude, ChatGPT, or Muse.

One tap, then about a minute.

Free to add. Ask it for a number when you're ready, or set your line up yourself first.

Before you tap

Straight answers.

Do I need a Grok Bot?

No. The line works on its own. Call it, text it, and ask it to make calls from your dashboard. If you do have a Grok Bot, or another assistant that supports MCP, connecting it lets your assistant make calls and read the summaries by itself.

What happens when someone calls my line?

It answers as your assistant in a natural voice and has a real conversation. It finds out who is calling and what they need, and writes down the amounts, dates, options, and next step. People you've approved get through warmly. Strangers get a polite assistant that never shares your details.

Does it pretend to be human?

No. It introduces itself as your assistant, and it says it's an AI whenever anyone asks. People are more helpful when they know.

Can it spend money or commit me to things?

On a call, no. It never gives out a card number or agrees to a charge, so a booking or appointment is the most it commits you to. Your plan's minutes are the only thing the line itself spends, and app orders (dinner, groceries) go through only after you confirm.

What does it cost?

Starter is $29 a month with 60 minutes of calls. Plus is $69 with 200 minutes. Pro is $149 with 600. Extra minutes are $0.25 each, rounded up per call. Every plan includes the number, the email address, and the assistant connection.

Which numbers can I get?

Any US area code with numbers available. You pick the exact number from a short list. Canada is next.

All questions and answers →

Give your Chief of Staff a phone.

Pick a number, save the contact, make the first call. About a minute.

Get your line